Advance due date. Methods allowing to calculate PDR, their reliability and error reasons
SUPPLIED
DATE OF DELIVERY
LAST PERIOD
Last day of menstruation: Estimated due date: Left before delivery: Zodiac:
The gestational circle is a convenient and simple tool for determining the gestational age, the expected date of delivery, as well as some other information about pregnancy. Our gestational disc allows you to determine not only the gestational age, date of birth, but also the height and weight of the fetus, and even the zodiac sign of the future child.
Using our gestational circle is very simple.
If you don't know how old you are, scroll the inner circle so that the green arrow points to the first day of your last period.
green arrow
Wherein arrow "today" will indicate today's date and week of pregnancy, as well as the height and weight of the fetus. Then arrow PDR indicate the expected date of birth.
arrow "today"
If you already know your deadline, then scroll the inner circle so that arrow "today" indicated the week of your pregnancy. Then it will also indicate the height and weight of the fetus, and arrow PDR will indicate the expected date of delivery. In this case, the green arrow will point to the first day of the last menstruation.
arrow PDR
See also:
The easiest and most accurate pregnancy calculator: how to use the gestational circle
From school biology lessons, everyone knows that it takes a woman 9 months to bear a fetus. However, this is a very average value that is not used in obstetrics and gynecology. Doctors monitor by weeks and trimesters. But even these figures cannot be called absolutely accurate. The period from the beginning of the last menstruation directly to childbirth takes an average of 40 weeks or 10 obstetric months. A gestational disc will help you find out the date of birth at the beginning of the last menstruation and track changes.
What does "gestational" mean?
Many hear this word for the first time in a antenatal clinic. The Latin gestatio literally translates as "bearing." Therefore, "gestational" means "pertaining to pregnancy."
Gestational age is calculated from the moment of conception. Determining exactly when this happened is extremely difficult. It may take up to several days for a fertilized egg to implant after intercourse. On the initial stage Even a few hours play an important role in the development of the embryo. Therefore, the inaccuracy in the definition of " starting point» leads to a relative conditionality of the calculation.
Gestational disc for determining due date
There are different calculators, the main purpose of which is to establish the date of the baby's appearance. Gestational circle- an indispensable tool for preparing for childbirth and better control of the pregnancy process. With its help, every woman can determine the "X date" at home. This is necessary, since premature and late births pose the same danger. Therefore, it is important to calculate the expected day of delivery and, as it approaches, carefully monitor the signals of the body.
Statistics say that about 2% of babies are born on exactly the calculated day. The date that the calculator will show is better considered conditional. Most likely, the baby will be born a few days earlier or later. Normal childbirth is considered between 38 and 40 weeks. But each organism has its own unique features. Some women live up to 42 weeks, in which case maximum attention from doctors is required.
The gestational circle is one of the most informative calculators. In addition to the estimated date of birth, it can be used to determine the height and weight of the embryo as it develops. In addition, many parents are interested in what sign of the zodiac and in the year of which animal Eastern calendar a child will be born. For some couples, it helps to choose a name.
How is the gestational cycle
With this visual calculator, it is easy to determine the due date and track the height and weight of the fetus during pregnancy. The outer disk is divided into 12 months. Each day corresponds to one division on the scale. For convenience, long marks are indicated every 5 days.
The numbers 1-40 on the moving part of the disc correspond to the weeks of pregnancy. Also, using a background with different saturation, trimesters are highlighted: the first - from to , the second - from to , the third - from to . Closer to the center is the scale of weight, and at the last level - the growth of the fetus.
There are 3 arrows on the circle: green thin (first day of the last menstruation), EDD (estimated date of birth) and a static “today”. In the center of the circle, basic information is displayed: the beginning of the last menstruation, the expected date of birth and the baby's zodiac sign. In the area under the disk, the number of weeks and days before childbirth is instantly calculated, as well as zodiac characteristics.
How to use a gestational disc to determine the gestational age
The gestational circle is used by many obstetrician-gynecologists in different countries, including in Russia. The simplicity of the method allows it to be used by absolutely every woman.
When planning a pregnancy, it is especially important to keep a menstrual calendar. This will help to determine the expected date of birth as accurately as possible. To calculate the gestational age according to the gestational circle, it is enough to move the thin green arrow to the date of the start of the last menstruation. The PDR arrow will indicate the date of delivery, provided that the pregnancy ends at 40 weeks. Using the “today” arrow, it is easy to track the average height and weight of the fetus for each week.
For example, the last menstruation was from 12 to 16 December. For the calculation of the gestational circle, only the first date is important - December 12. Set the thin green arrow to this number. Twisting the arrow, pay attention to the center of the circle. This is much more convenient than peering into divisions. The “today” arrow indicates that the woman is at the beginning of the 8th week of pregnancy, the fetus has grown to 18 mm and weighs 1 g. You need to prepare for childbirth within 1-2 weeks from September 18th.
What should a woman do if she does not know the date of her last menstrual period?
To independently determine the date of birth of a child in this case, the gestational circle will be ineffective. Usually, doctors prescribe a blood test for hCG. Chorionic gonadotropin is a hormone that is released in the body of a woman after implantation of the embryo in the uterus at 4 obstetric weeks. From this point on, you can get the most reliable results.
When using the strip test at home, the second strip may be translucent. This indicates either the unsuitability of the test, or a small amount of the hCG hormone in the body. To obtain reliable results, you need to try again in a week if menstruation does not begin. A weakly pronounced second strip can appear in women taking hormonal drugs, regardless of pregnancy.
A home test only shows the presence of pregnancy. According to the result of a biochemical blood test, its duration is determined. Don't put off checking. Analysis for hCG is most reliable in the first 12 weeks. Gradually, the level of the hormone decreases, and for more later dates it is difficult to determine the time of conception.
When the week of pregnancy is known, the gestational circle can be used to calculate the date of delivery and determine the size of the fetus. To do this, just set the “today” arrow to the mark corresponding to the current date.
For example, it's week 9. At this stage of development, the embryo has reached 23 mm and weighs 2 g. The expected date of birth is September 9. The green arrow indicates the approximate date of the last menstrual period.
Errors
gestation - difficult process which is different for every woman. Moreover, the course of the first pregnancy does not mean that the next ones will follow the same scenario.
The pregnancy calculator allows a certain error. In addition, when setting the initial data, errors are not ruled out. The accuracy of the calculation depends on the individual characteristics of the organism. The pregnancy wheel shows the most accurate result with a standard menstrual cycle of 28 days. If the duration is longer, for example, 35 days, then ovulation will occur on average on the 21st day. This leads to an increase in the difference between obstetric and embryonic terms.
In addition, the error can be provoked by inaccuracy in determining the embryonic period. Spermatozoa are able to survive in female body up to 3 days. Fertilization can occur at any time. Considering all factors, including individual characteristics the body of the expectant mother, the error in calculating the expected date of birth often reaches 2 weeks. Ultrasound gives more accurate results, although the method of calculating the beginning of the last menstruation is recognized worldwide as one of the best.
Why in the first two weeks the height and weight on the disk correspond to zero
You can see that in the first two weeks the indicators are zero. However, this period is part of the entire pregnancy cycle. The fetus in the womb develops surprisingly quickly. Therefore, in determining the date of birth, every day is important. At the same time, there are different terms - obstetric and embryonic, which are important not to be confused.
Some mistakenly believe that the first week is counted from the moment of conception. In fact, pregnancy begins with last day menstrual cycle. Directly during this period, the birth of a new life could not occur. The moment of conception depends on ovulation and varies within a couple of weeks.
With a standard menstrual cycle of 28 days, ovulation occurs on the 14th day. In this case, the embryonic period will lag behind the obstetric period by about 2 weeks. In practice, this means that at the end of the first month of pregnancy, the actual age of the embryo is only 2 weeks.
Why sometimes calculations by different methods do not match
Many women are surprised to find that the dates of birth according to various calculations do not match. Which one to believe?
In official medicine, it is believed that embryos develop in the same way during the first trimester. On ultrasound, the gestational age is determined according to the table of correspondence between the size of the fetus and a certain period of development. For example, the calculation for the last menstruation shows the result of 12 weeks, and the diagnostician calls 11 weeks. More reliable is considered to be the period set during the first ultrasound. In this example, the difference is due to early ovulation, but it can be late. For the doctor, the result ultrasound is a priority.
During the second and third trimesters, each fetus develops at its own pace. Therefore, the data from the averaged tables may not be in fully correspond to reality. Deviations within one week are considered normal. In the ultrasound protocol, the specialist indicates what period the development of the fetus corresponds to.
The gestational circle gives an idea of how the unborn child develops every day. At the beginning of the first trimester, the embryo gains only a couple of grams every week, but the difference, for example, between and 21 weeks is an average of 71 g. It is interesting for every woman to know how the fetus changes. With the gestational circle, observation becomes simple and even more fun.
The most important weeks of pregnancy
In order for the fetus to develop correctly and the child was born healthy, the fact of pregnancy must be established as early as possible. It is not at all necessary that future mom intuitively feel the conception, or from the first weeks there will be clear signs in the form of a heightened sense of smell, morning sickness, etc. It is not uncommon for a woman to find out about pregnancy only by her enlarged belly.
For pregnant women, the following factors are of particular danger:
- Unhealthy habits.
- Stress.
- Unbalanced diet, deficiency useful substances(mainly iron and folic acid).
- Great physical activity.
- Overheating or hypothermia.
- Taking medications that are incompatible with pregnancy.
- Infectious and inflammatory diseases.
It is necessary to prepare the body for pregnancy in advance in order to minimize the risks for the fetus and the expectant mother. But even if everything goes according to plan, there are times when extra care must be taken. If at any stage of pregnancy a woman feels severe discomfort, burning, or even unreasonable anxiety, you should visit a doctor.
When to be extra careful
Critical periods coincide with the phases of active growth of the embryo and placenta. The most dangerous weeks are the following:
- I trimester - 2-3, 4-7, 8-12.
- II trimester - 18-22.
- III trimester - 28-32.
The insidiousness of the first weeks is that a woman may not be aware of pregnancy. As a result, they do not mandatory conditions. From 4 weeks, the main organs are formed. During this period, it is especially important to follow the doctor's instructions in order to prevent pathologies. At the last critical stage of the first trimester, the placenta is formed - a natural shield that will increase with the fetus.
The period from to 22 weeks is considered the most important. At this time, the unborn baby is most active. The biggest risks to the life of the fetus and the health of the woman are sexually transmitted infections. One of the main conditions is to use barrier protection during sexual intercourse.
By the beginning of the third trimester, the fetus is as similar as possible to a baby, but it is not yet able to survive separately from the mother's body. Causes of preterm labor may include placental abruption, infections, and isthmic-cervical insufficiency. To prevent this, you need to follow absolutely all the doctor's instructions, take care of your own health and eliminate stress.
There are no critical periods on the gestational circle. This is due to the fact that they do not have to be difficult at all. The more you focus on the dangers, the stronger the destructive effect of stress. You can use the pregnancy wheel during the entire period of gestation. On the diagram, it is convenient to track the transition to a new trimester, the stages passed and the approaching date of birth.
Description
The Universal Pregnancy Calculator is a convenient and practical tool calculation of a number of parameters that are important and interesting for the expectant mother. The calculator is a circle that looks like a watch dial, inner part which can be rotated, setting one or another arrow to the desired position. For example, by setting a thin green arrow so that it points to the first day of the last menstruation, you will determine the date of future births by the arrow "PDR", and by the arrow "today" you will find out what week of pregnancy you are now, and what is the height and weight of the fetus on present day. The Pregnancy Wheel can also be used in other ways. For example, if the birth has already taken place, then you can set the arrow "Ed" (estimated date of birth) so that it points to the day of birth. Then a thin green arrow will show you the date on which you had your last period before pregnancy. Among other things, the calculator determines the zodiac sign of the unborn child, and even his zodiac animal according to the eastern calendar.
How to find out the date of birth? About the method of calculating the date of birth
For estimated due date calculation obstetrician-gynecologists have a very convenient and simple formula: 9 months and 7 days are added to the date of the first day of the last menstruation. And you can calculate even easier - from the first day of the last menstruation, count back 3 months and add 7 to the resulting number.
Estimated date of delivery = date of the first day of the last menstruation + 9 months + 7 days.
Estimated date of delivery = date of the first day of the last menstruation - 3 months + 7 days.
But these terms are typical for the average woman with an average 28-day menstrual cycle and ovulation on the 14-15th day of the cycle.
The average pregnancy lasts 266 days (38 weeks) from conception, or 280 days (40 weeks) from the first day of your last period. If the menstrual cycle of the future mother is shorter or longer than the average 28 days, or ovulation did not occur on the 14-15th day of the cycle, then the pregnancy can also be longer or shorter. Therefore, it is generally accepted that 280 days is an approximate number of days of pregnancy and a child can be born between the 266th and 294th day (38–42nd week) of pregnancy.
Calculation of the date of birth by the day of conception is not an accurate method for determining the due date. Even if you know exactly the day when sexual intercourse took place, this does not mean that conception occurred on that day, since spermatozoa are able to remain active in the vagina for up to several days.
How else can you determine the gestational age and calculate the date of birth?
Determining the gestational age with ultrasound
On the early dates, up to 12 weeks of pregnancy, you can calculate the date of birth using ultrasound quite accurately. Over long periods, this is often difficult due to the fact that each child grows at his own pace. Namely, such indicators as the sizes of different parts of the fetal body are the basis for calculating the gestational age.
Determination of the gestational age during a gynecological examination
During pregnancy, the uterus begins to gradually increase in size and takes on a spherical shape. With a gynecological examination up to 12 weeks, the doctor can determine the approximate gestational age by the size of the uterus. For periods of more than 16 weeks, when the uterus extends beyond the womb, you can determine the period by the height of the standing of the bottom of the uterus during examination of the abdomen. Naturally, this method of determining the gestational age is not accurate.
Determination of the gestational age by the first movement of the child
Another auxiliary method for determining the gestational age and calculating the date of birth is by stirring. Despite the fact that the child begins to make movements quite early, the mother can only feel them when the baby reaches a certain weight. This usually happens in nulliparous women at 18-20 weeks of gestation, and in multiparous women 2 weeks earlier. However, some women claim that they feel movements as early as the 14th week and sometimes earlier.
Using all of the above methods, you can more or less accurately determine the gestational age, but the date of birth will still be approximate. This means that the chance of giving birth on the due date +/- 3 days is about 70%. Do not forget that the child's readiness for extrauterine life also affects the date of birth. Some children of the so-called morpho-functional maturity can reach the 38th week, while others - at the 41st.
Pregnancy- a period of change in a woman's life. How many new things she has to learn about herself and her body, about children and even about medicine. How many new terms she will hear! PDR and the pregnancy calendar are one of them. In this article, we will look at what it is.
Everyone knows that pregnancy lasts 9 months. However, having become pregnant, the expectant mother discovers that the term is measured not in months, but in weeks, and there are 40 of them, that is, almost 10 months. Moreover, the child is considered full-term from 38 weeks. The pregnancy calendar is a list of changes that occur with the body of the expectant mother and with her baby for each week of gestation. The term itself is divided into three periods, called trimesters. Let's consider each of them.
First trimester of pregnancy
In the first three months of pregnancy, the egg is fertilized, then it attaches to the uterus (implantation, i.e. the actual onset of pregnancy) and the formation of the fetus. Initially, the embryo does not look like a person at all: it is just a small ball.
By the end of the first month, the size of the embryo is only 4 mm. It's about the size of a grain of rice. And yet, he is already forming internal organs Key words: neural tube, heart, genital gonads. On the 21st day of pregnancy, with the help of ultrasound, you can hear the heartbeat of a little man: 110-130 beats per minute.
On the 4th-5th weeks there is an active development of the brain. The head takes up a third of the total size.
Between the 7th and 8th weeks, the embryo develops into a fetus. There is separation of the fingers and toes. And from the 8th week it is officially called the fetus.
At 8-9 weeks, all facial features are already distinguishable, the genitals, intestines are formed, fingers appear on the hands.
At 10-12 weeks, the baby begins to move, but the mother does not feel it yet, nails appear on the fingers, and the rudiments of teeth appear in the gums. The heart is fully formed, and the endocrine system begins to produce hormones.
In the first trimester of pregnancy, the expectant mother may experience toxicosis: nausea, sweating, increased salivation, itching of the skin, etc. This is a rather difficult period in the life of both the child and the mother. The mother-placenta-fetus relationship is formed. There is a real hormonal storm in a woman's body!
At about 11-13 weeks, the doctor prescribes the first screening test, which consists of a blood test and ultrasound. It is during this period that it is possible to determine the presence of such genetic diseases as Down syndrome, Edwards, Patau, de Lange, Smith-Opitz.
Second trimester of pregnancy
This is the period from the fourteenth to the twenty-seventh week bearing a child. This is the most fertile time of pregnancy: the first fears and anxieties are over, toxicosis has already ended, but at the same time, the tummy is not too big and does not constrain mom in activities. Enjoy!
During this period, there is an active growth and development of the child. If at the beginning of the second trimester the child was only 10 cm with a weight of 30 g, then by the end it is already as much as 1.2 kg with a height of 35 cm!
The child is actively moving. He explores himself: touches his face with his hands, sucks his fingers, plays with the umbilical cord. Most of the time it is upside down, but it can also turn over. From about 18-22 weeks, a woman begins to feel these movements. The primiparous mother feels them later, around the 20th week, and the "experienced" mother - a little earlier: at the 18th week.
A thin fluff appears above the upper lip, on the eyebrows and on the head. This is latungo. It is designed to keep the original lubricant on the baby's body.
During this period, the tummy begins to grow noticeably. Your old clothes become tight and it's time to replenish your wardrobe with "pregnant" clothes. Pay attention to special tights for pregnant women, trousers, dresses and tunics. In addition, your doctor may prescribe that you wear a support bandage.
At 16-18 weeks, you will need to undergo a second trimester screening. It includes an ultrasound and a blood test (the so-called "triple" test for the level chorionic gonadotropin, alpha-fetoprotein and estriol). This allows you to identify malformations and chromosomal abnormalities of the fetus.
Third trimester of pregnancy
This is the period from the 28th week of pregnancy until the birth itself. Finish line. The period of final formation of the child. At this time, there is a risk of premature birth and late toxicosis (gestosis). Pregnancy is considered mature from the 38th week. Those. if the birth has occurred since the first day of the 38th week, then the child is considered full-term.
This is the period of the final formation of the child: nails grow to the fingertips, permanent teeth are formed under the milk teeth. The child begins to hear and distinguish voices. Now he knows his mother's voice and prefers it to all others after birth.
The movements of the baby are more and more clear. He pushes and kicks, and now not only you can feel it, but also any person who puts his hand to your stomach. By the end of the gestation period, the child becomes so large that it is already difficult for him to perform somersaults and he remains in one position. Most children turn their heads to the lower abdomen. This is called head presentation. If the child lies down with his feet or buttocks, then this is a breech presentation.
In the third trimester, the body of the expectant mother begins to prepare for childbirth. The cervix becomes more elastic, colostrum can be released from the breast.
It becomes difficult to move because of the grown belly. For the same reason, heartburn may begin and hemorrhoids will be found.
During this period, it is better to prepare all the necessary things for the hospital and for the baby.
How to calculate the due date: weekly pregnancy calendar
Having examined in detail the stages of the formation and development of a child in the womb, we came to the concept of PDR, that is, the expected date of birth. From the name it is clear that this is the expected date of birth of the baby. There are several ways to determine it, which will be discussed below. However, it is worth noting that only 17% of children are born on the date of the due date. The remaining 83%, that is, the absolute majority, are born "around" the DA (if we do not talk about emergency unplanned or premature births).
Determination of the term by the date of conception
If the pregnancy was planned, then, usually, the exact date of the sexual intercourse that led to it is known. To this date, 280 days are added (i.e. 40 weeks) and thus the DA is determined. This method is the most accurate, but not one hundred percent (as, in fact, no other). Deviations can be within 1-3 days, since fertilization itself can occur not directly on the day of sexual intercourse, but within a few days after it.
Determination of the period by the date of menstruation
This is the most commonly used method in obstetrics for determining the PDR. It was proposed by the German obstetrician Negele. The calculations are as follows: three months are subtracted from the first day of the last menstruation and 7 days are added. That is, if the last menstruation began, for example, on June 1, subtract 3 months (March, April, May), add 7 days and get the EDD on March 8.
Determination of the term by the date of ovulation
Another way to calculate the estimated date of birth is to calculate by the date of ovulation. 280 days are added to this date and the DA is obtained. However, the complexity of this method lies in the fact that not all women follow their cycle and even more so do not know their ovulation schedule. If you are attentive to your health, then this method can help you find out the date of birth of your child.
Ultrasound calculation accuracy
The date of delivery is also determined at the first mandatory ultrasound, during the screening of the first trimester. It must be completed at 8-11 weeks. During this period, the doctor determines the compliance of the size of the child with the expected gestational age and determines the PDR. This method is the most accurate. However, no method provides an absolute guarantee. In addition, doctors prefer to combine several methods to determine the date of birth.
How to calculate the sex of the child: weekly pregnancy calendar
"Who are you waiting for: a boy or a girl?" - this is the most asked question of a pregnant woman. Disputes about the sex of the baby often begin even before conception and do not stop until the very birth. And since this is such an important question, we decided to look at several ways to find the answer to this question.
Determination by blood group
This method can be divided into several subspecies.
Determination by blood group. You need to know the blood type of mom and dad and see the result in the table. The reliability of this method is very doubtful, because in practice children of different sexes are quite often found in the same family.
Blood type | ||||
| I | II | III | ||
| Girl | Boy | Girl | ||
| Boy | Girl | Boy | ||
| Girl | Boy | Boy | ||
| Boy | Girl | Boy | ||
According to the Rh factor. He matters too. If it is the same for both parents, then there will be a boy, and if it is different. That is possible options. This method is also unreliable. In addition, it can produce the opposite result with the previous one.
For the renewal of the blood. Its essence lies in the fact that the blood of a man and a woman is renewed at different speeds: for women every 3 years, and for men every 4. Whose blood will be “younger” at the time of conception, the child will be born of this gender. To do this, the age of the mother is divided by 3, and the father, respectively, by 4. But it is worth considering large blood loss: donation (both blood donation and transfusion), operations, abortions, injuries. Those. should be counted from the date of the last blood loss.
Let's look at an example. Let the expectant mother at the time of conception be 26 years old, and the father - 29. Divide 26 by 3, we get 8.7 and 29 by 4, we get 7.3. We analyze the numbers after the comma: 7 for mom and 3 for dad. It turns out that the father's blood was renewed quite recently, that is, the parents, most likely, will be waiting for the boy.
Determination of the sex of the unborn child using ultrasound
This is the most reliable of the publicly available methods. However, its veracity directly depends on the timing of the study and the experience of the doctor. Until the 8th week of pregnancy, the baby does not have a gender. The process of formation of the genitals ends by about 10-12 weeks.
But doctors recommend performing an ultrasound to determine the sex no earlier than the 15th week. However, most often everything is found out during the screening of the second trimester (22-25 weeks of pregnancy). On the monitor, the doctor should visualize the scrotum and penis, if the child is male, and the labia majora, if female. Sometimes the loops of the umbilical cord or the fingers of the fetal hand are mistaken for the penis, and in utero girls there is a swelling of the labia that passes over time, which are mistaken for the scrotum.
Definition by the appearance of a pregnant woman
One of the most controversial and even playful ways, which, nevertheless, sometimes gives a result. What is called, "not thanks to, but in spite of." It is popularly believed that if the stomach sticks out like a ball, then a boy is sitting there, and if it is flatter, neater, then a girl.
However, the shape of the abdomen is influenced by two factors: the size of the baby and its intrauterine position. Yes, indeed, boys are often larger than girls, but not so much that it affects the size of the abdomen. Well, the intrauterine position does not depend on gender at all and can change throughout pregnancy.
Sex determination by folk methods
Folk methods have been passed down from generation to generation since the days when there was no ultrasound. What our great-grandmothers and grandmothers did not think of! Now all this seems more like an anecdote than a real way to find out the gender of the child, but still let's talk about them. As they say, a moment of positive.
- Wedding ring method. should be hung wedding ring on the thread over the arm or belly of the expectant mother. If it starts spinning in a circle - wait for a girl, if from side to side - a boy. Instead of a ring, you can use a needle or nut.
- Divination with a key. You need to find a round key, with a round head and a long leg, and put it in front of the pregnant woman. If she took him by the head - to the girl, if by the leg - to the boy, if in the middle - to the twins.
A few more clues:
- If during pregnancy the future father is gaining weight on a par with his wife - to the boy, if the woman has recovered in the hip area - to the girl.
- If the expectant mother began to look worse (pimples or age spots appeared on her face, redness), it means that the girl, as it were, “takes away beauty”. If the pregnant woman looks great for all months, expect a boy.
- If there is a boy in the stomach, then it draws on sour, salty, meat and milk; if a girl, then she is drawn to sweet and fruity.
- Expectant mothers of boys have an increased appetite throughout pregnancy, and mothers of girls feel sick, especially in the first trimester.
Chinese pregnancy calendar: How to calculate the gender of the baby
It is a table, which, according to legend, was found in one of the burials in ancient China. Shows the relationship of the sex of the child with the age of the mother and the month of conception.
Japanese baby gender calendar
Japanese calendar based on the relationship of the sex of the child and the months of birth of the parents and the month of conception. In the first table, find the number at the intersection of the months of birth of the mother and father. Then, in the second table, find the column at the top of which is this number. It indicates the months of conception, and opposite each month is the probability of the birth of a boy or girl, expressed by the number of crosses. The more crosses, the higher the likelihood of conceiving a child of one sex or another.
Month of birth | Birth month of the future father | |||||||||||
| Jan | Feb | mar | Apr | May | june | july | aug | sep | oct | but I | ||
| 1 | 5 | 9 | 1 | 5 | 9 | 1 | 5 | 9 | 1 | 5 | 9 | |
| February | 10 | 2 | 6 | 10 | 2 | 6 | 10 | 2 | 6 | 10 | 2 | |
| 7 | 11 | 3 | 7 | 11 | 3 | 7 | 11 | 3 | 7 | 11 | 3 | |
| April | 4 | 8 | 12 | 4 | 8 | 12 | 4 | 8 | 12 | 4 | 8 | |
| 1 | 5 | 9 | 1 | 5 | 9 | 1 | 5 | 9 | 1 | 5 | 9 | |
| June | 10 | 2 | 6 | 10 | 2 | 6 | 10 | 2 | 6 | 10 | 2 | |
| 7 | 11 | 3 | 7 | 11 | 3 | 7 | 11 | 3 | 7 | 11 | 3 | |
| August | 4 | 8 | 12 | 4 | 8 | 12 | 4 | 8 | 12 | 4 | 8 | |
September | 1 | 5 | 9 | 1 | 5 | 9 | 1 | 5 | 9 | 1 | 5 | 9 |
| October | 10 | 2 | 6 | 10 | 2 | 6 | 10 | 2 | 6 | 10 | 2 | |
| 7 | 11 | 3 | 7 | 11 | 3 | 7 | 11 | 3 | 7 | 11 | 3 | |
| December | 4 | 8 | 12 | 4 | 8 | 12 | 4 | 8 | 12 | 4 | 8 | |
| 2 | 3 | 4 | 5 | 6 | boy | girl | 7 | 8 | 9 | 10 | 11 | ||
| X | |||||||||||||
| Feb | mar | x | |||||||||||
| Feb | mar | Apr | x | ||||||||||
| Feb | mar | Apr | May | xx | |||||||||
| Feb | mar | Apr | May | june | x | ||||||||
| mar | Apr | May | june | july | x | ||||||||
| Apr | May | june | july | aug | x | ||||||||
| May | june | july | aug | sep | x | xx | Jan | ||||||
| june | july | aug | sep | oct | xxxxxxxxxxxxx | x | Jan | Feb | mar | ||||
| june | july | aug | sep | oct | but I | x | x | Jan | Feb | mar | |||
| aug | sep | oct | but I | dec | x | x | Jan | Feb | mar | Apr | May | ||
| aug | sep | oct | but I | dec | x | x | Jan | Feb | mar | Apr | May | ||
| oct | but I | dec | xxxxx | x | Feb | mar | Apr | May | june | july | |||
| oct | but I | dec | x | xxxxxxxxxx | mar | Apr | May | june | july | ||||
| dec | xxx | x | Apr | May | june | july | aug | sep | |||||
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The need to calculate the gestational age by weeks occurs in almost every pregnant woman and more than once during pregnancy. And this is necessary not only in order to simply know your due date or correctly track the pregnancy calendar. I also want to calculate the duration of pregnancy and childbirth in order not to doubt the correctness of the doctor’s actions, if they make a mistake in the consultation - this can also affect the date of going on maternity leave, you don’t want to work an extra couple of weeks, right?
First, some general information.
Our calculator will help you calculate the obstetric gestational age, it is slightly different from the actual life of the fetus. Gynecologists build all their calculations on the date of the first day of the last menstruation, and do not count from fertilization, this is due to the ease of error in the date of conception.
Ovulation in a woman can significantly shift in time, especially if she does not have a regular cycle, and of course, not everyone can know the exact date of fertilization, it is difficult to calculate the gestational age from ovulation. And the date of the beginning of the last menstruation, as a rule, is known.
We have a special calculator that allows you to independently calculate the gestational age online. He will give you information not only about the obstetric gestational age, but also the date of conception, the age of the fetus, the date of birth.
The problem may arise if yours is not regular. How to correctly calculate the gestational age by menstruation with an irregular cycle? You need to add the length of the last 6 cycles and divide by 6, so you get the average duration, this is the number of days and you need to enter in the calculator field.
All data obtained can be easily controlled using other calculation systems.
You can accurately calculate the gestational age (well, or relatively accurately, as gynecologists think) using the Negele formula. It does not take into account the length of your cycle and therefore the result may differ from the period that our calculator gives, but this will certainly coincide with the calculations of the gynecologist: we subtract 3 months from the first day of the delay in menstruation and add 7 days to the date obtained. This is your due date. Calculate the gestational age by months, weeks and days, as with our calculator, using this formula will not work.
If you had an ultrasound, the doctor measured the development of the baby. Its weight, the length of the bones make it possible to calculate the gestational age by ultrasound, but this calculation is accurate only in the first trimester, the longer the period, the greater the difference in physical development in different children, and there is a higher risk of error in determining the timing of pregnancy.
Almost all calculation methods carry a certain risk of error, which is why only 4% of children are born on the PDR (preliminary date of birth).
It is better to evaluate the results of calculations in a complex (ultrasound, date of the last menstruation, first movement and other dates and signs). And still, the date of birth can fall between 37 and 42 weeks of pregnancy.
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Calculation of the last monthly through an online calculator
Pregnancy term calculator
How the body of women changes by week
In the images you can see a rough illustration of the development of the baby inside the womb for each week. To the left of the images is short description fetal growth for a given week. For more complete and detailed information, you can find by clicking on the "More" link, which is located under each description.
Weekly pregnancy calendar is very handy.
Knowing how pregnancy goes by week is not only interesting, but also very useful! The pregnancy calendar will help you with this. It is designed to keep the mother informed of all the events of intrauterine development, to help adjust nutrition and lifestyle during different periods of pregnancy. In addition, the pregnancy calendar allows you to calculate the expected date of birth.
Weekly pregnancy calendar
It will facilitate medical supervision of the expectant mother and her baby, and will also give answers to the most important questions that you will certainly face: when the stomach begins to grow, why it makes you feel sick during pregnancy, how to recognize the first fetal movement.
Thanks to this calendar, you will not forget that the time has come to undergo screening, take tests, go for a scheduled ultrasound. And with the approaching date of childbirth, such a weekly calendar will help you prepare in the best way for the long-awaited event.
This pregnancy calculator will allow you to calculate how long you are now, the date of your future birth, the date of conception, and even the zodiac sign of the future baby and his zodiac animal according to the Eastern calendar. You can also determine the age of the fetus, its weight and height, and how much time is left before delivery. To do this, you need to enter the date of the first day of your last period and the length of your menstrual cycle. In addition, our calculator generates a very convenient and practical weekly pregnancy table. Using it, you can navigate which week of pregnancy you are currently in, as well as track the height and weight of your unborn child.
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Monthly pregnancy calendar.
By month
Monthly pregnancy calendar will be your guide for all 40 weeks of pregnancy. Every expectant mother will be able to leave her reviews, observations, share experiences and useful information. Together we will monitor how quickly our kids grow and develop! And give advice on the right way of life, the way of eating and the safe treatment of all sorts of ailments.
Every month of pregnancy is distinguished by serious changes in the development of the child: he achieves more and more success in physical and mental development, the baby’s brain is growing intensively, muscle mass, vital organs and systems are formed, and even the first natural skills! The pregnancy calendar by month will acquaint you in detail with these events at each stage.
Personal pregnancy calendar
Every woman can keep a personal pregnancy calendar. Moreover, it is welcome and recommended. You are in a very special state right now. Many sensations are new to you, and can even cause excitement and fear - the body of a pregnant woman undergoes tremendous changes, both in a physiological sense and in a psychological one.
The weekly and monthly pregnancy calendar has been compiled with an attempt and purpose to explain each of them.
You can have a personal pregnancy calendar in a separate notebook, which you decorate according to your mood, tastes, feelings, and who you expect: a boy or a girl. Such an album will be a great start to a family chronicle or a chronicle of the life of your heir.
Interactive pregnancy calendar
But in addition, modern expectant mothers resort to the services of the Internet and choose an interactive pregnancy calendar for observation. It's convenient, easy to use, accurate, practical, informative, and completely free!
You can resort to its help when you need to quickly determine the date of birth or accurately determine the current gestational age (using a special calculator for this), divide your pregnancy into trimesters, months or weeks.
Online pregnancy calendar is becoming more and more popular. Women want to know more about this special period: what are the first signs of pregnancy, how to avoid miscarriage, what to do with increased uterine tone, how to find out the first harbingers of childbirth, how to determine the sex of the child. The calendar contains articles, tips, explanations, and a calculator for determining the duration of pregnancy and the expected date of delivery.
You can conduct personal monitoring of your own pregnancy, your condition and that of your child, and carry out the calculations that interest you.
Online pregnancy calendar - at your service! Keep your finger on the pulse of the most important events in your life!
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How to correctly calculate the gestational age by weeks and days
Obstetrician-gynecologists start counting the gestational age from the first day of the last menstruation. Usually, the actual period is 13-16 days less, since conception occurs approximately in the middle of the menstrual cycle, i.e. at the time of ovulation. However, to avoid confusion, doctors start counting the gestational age 2 weeks before the date of conception.