Calculate gestational age by last menstruation online. Ways to calculate the gestational age. According to measurements of the uterus
The most detailed pregnancy calendar
The happiest time in the life of every woman - pregnancy - is divided into time stages: trimesters, months, weeks. Each of these units of time has the peculiarities of its course - both in the body of the expectant mother and in the body of the future baby. We will talk about all this in the most detailed and understandable way.
Living stories to help
In addition to medical (gynecological) information from experienced obstetricians, we will share with you the real stories of thousands of Babyblog mothers on the pages of our calendar. They are equipped with expressive photographs, ultrasound images, descriptions of sensations in one or another obstetric week of pregnancy. We will also give you tips and recommendations for each of the stages on the road to a miracle.
On the verge of a miracle
In order to receive a newborn carefully wrapped in a diaper for the first time, to hear its first cry, to smell its smell, you have to climb the happy ladder of forty steps - forty weeks. Not one of them stumble, do not grumble about fate, do not complain about ailments. On the top step of this amazing staircase, you will spread your wings and go on a magical flight of happy motherhood. The miracle is close at hand!
Listen to Experienced Moms
It is very important at the time of bearing a child not to worry once again, not to quarrel with loved ones, not to allow phobias and stress. It is for this purpose that each week of pregnancy in our unique calendar is accompanied by useful tips and good recommendations from experienced mothers who have gone through this path more than once. You will be calmer when at each time stage you can find out the experience of other mothers in this or that issue of your well-being and the healthy course of pregnancy.
How is the pregnancy going?
In the first obstetric week of pregnancy, the female body begins to prepare for possible fertilization, which will occur later.
In the second week, the "leader" in this cycle is determined - the egg, which will give rise to a new life.
As a rule, at the end of the second - the beginning of the third obstetric week of pregnancy, fertilization occurs - the fusion of a mature egg with the most nimble and persistent sperm from a huge number of applicants. As a loving man completely dissolves in the object of his passion, so the spermatozoon dissolves inside the parent egg. The genetic information of the parents is combined. Now a new life exists!
At the fourth week, the baby is a lump of rapidly dividing cells. When viewed under high magnification, the embryo resembles a raspberry.
At the fifth week of pregnancy, the laying of the most important systems begins. Now the heart, blood vessels and respiratory system are being formed - something that is vital for independent existence.
Next week, the future baby has a hint of arms and legs, separate parts of the inner ear and larynx are formed.
At the seventh week, the fetus actively develops the brain, the gastrointestinal tract begins to form, and the lungs form.
In the eighth week, the great sculptor - nature is engaged in fine work. Ears, nose and upper lip are now formed, as well as fingers on the hands.
At the ninth week of pregnancy, the back of the embryo will begin to straighten, and the tail will “dry out”. The baby's brain develops at a tremendous pace.
The laying of milk teeth begins next week. The embryo is now surrounded by amniotic fluid, protecting it inside from shock and shaking.
At the eleventh week, the unborn baby already has sexual characteristics, and with the help of modern equipment, future parents can now find out who is inside - a charming girl or a strong little boy. In addition, the color of the eyes is determined in the fetus.
By the twelfth week of pregnancy, the future baby has practically formed all the systems of the body. In the remaining time, they will grow and develop.
The thirteenth week ends the first trimester of pregnancy. The placenta is fully formed. Now she will be responsible for the delivery of nutrients and oxygen from mother to baby.
At 14 weeks, the baby is covered with a gentle fluff - lanugo. It retains a cheese-like lubricant, which in turn protects the baby from the surrounding waters.
It has been proven that already at the 15th week of pregnancy, the baby's tiny heart passes more than 20 liters of blood per day. The skin of the belligerent is thin and red, it is still so different from a well-fed baby.
At the sixteenth week, the fetal head is no longer so pressed to the chest, it gradually straightens. The muscles of the face are developed, so the child can wink and frown.
At week 17, "brown fat" begins to be deposited, which is necessary for the body's heat exchange. But there is still no subcutaneous fat.
At the 18th week of pregnancy, the baby can already hear you, as the structures of the middle ear are being improved. It's time to talk to the child and sing children's songs to him.
The following week, the limbs grow and become more proportional.
At the twentieth week, the puffer is a miniature man - with a delicate fluff on his head and tiny nails on his fingers and toes. He has a lot to do - the baby yawns, sucks his fist, somersaults.
In the twenty-first week, blood cells begin to be produced, which are responsible for protecting the body from infections. Thanks to the developed papillae on the tongue, the fetus feels the taste of the surrounding waters.
At week 22, the baby strokes his arms, legs, face, sucks his finger and pushes off the walls of the uterus with his legs.
At the twenty-third week, the fetus begins to store subcutaneous fat.
At the 24th week of pregnancy, the baby becomes larger and more well-fed. It occupies almost the entire uterus, it becomes more and more difficult to tumble.
The next week, bones are strengthened, joints are formed.
At 26 weeks, the baby is able to open his eyes.
The third trimester starts with the twenty-seventh week. A baby weighing approximately 1000 g has all the main systems working, although their development has not yet been completed.
At week 28, the brain grows, new cells and nerve connections are formed.
At the twenty-ninth week, the baby has already learned to more or less regulate its own body temperature.
At the thirtieth week, the baby's eyes are wide open, he reacts to the contrast light penetrating through the mother's tummy.
The following week, the baby reacts to loud noises and pain. You can feel it move as the doctor feels your abdomen.
At 32 weeks of gestation, the baby hears perfectly what is happening outside the tummy. He recognizes the beating of his mother's heart, bowel movements and the sound of blood flowing through the umbilical cord. That is why the baby calms down after birth if the mother presses him to her chest, because he hears the usual sounds of her heart.
At 33 weeks, the baby still has enough space for movement, but every day the space of the temporary house - the uterus becomes more and more cramped for him.
By the next week, subcutaneous fat is already a tenth of the baby's weight, which gives the skin of the fetus a smooth and pinkish tint.
From week 35, the baby will gain 200-220 grams weekly to his current weight (approximately 2550 g).
The next week, the baby's face became smooth, plump cheeks appeared.
At week 37, the baby is ready for birth and has taken its final position in the uterus.
At 38 weeks, the baby lost lanugo. There is less original lubricant.
At the thirty-ninth week of pregnancy, the walls of the uterus contract from time to time, "rehearsing" childbirth.
At the fortieth week, fetal movements slowed down in anticipation of birth. His intestines are filled with original feces (meconium). The appearance of the crumbs into the world should be expected at any time.
At 41 weeks of pregnancy, all organs and systems of the unborn child are ready to start independent work at any time.
At 42 weeks, the baby grew long nails on all fingers, hair. His eyes are open, he is becoming more active again.
In our calendar, each week of pregnancy, we will consider in as much detail as possible. Welcome!
Pregnancy is one of the most exciting and at the same time crucial periods in the life of every woman, and therefore it is not at all surprising that each of us wants to know the date of birth as soon as possible. However, this issue often causes numerous disagreements and disputes. Expectant mothers “torture” doctors with their questions, because they want to prepare for an important event, but they only shrug, because they are not able to accurately determine the date of the birth of the long-awaited baby.
In order to Calculate the date of birth, click the "find the date of birth" button.
Today: 25.12.2019
Date of the first day of the last menstruation:
Conception most likely happened (+-2 days):
Estimated due date:
Left before birth:
The calculation of the expected date of delivery (ED) is carried out in several ways, each of which is indicative. That is, if, according to estimates, the baby should be born on January 1, then it is not a fact that this will happen with absolute accuracy on that day. Very often there are deviations from the expected date in one direction or another. And childbirth can begin either 2 weeks earlier or later. I bring to your attention a fairly simple, but very effective way to find out the probable due date of a child, which has been successfully used by many doctors in clinics for quite a long time.
Calculation on the last day of menstruation
So to be on your own calculate gestational age and on it to determine the expected day of birth, it is necessary to remember the date of the beginning of the last menstruation. It is on its basis that all calculations are made. From this date, you must subtract 3 months and add another 7 days to the result. The resulting number will be the estimated date of birth of your long-awaited baby.For example, the date of the last menstruation is April 22. So, from this date you need to subtract 3 months. Subtract and receive - January 22. We add another 7 days to this figure and get January 29 - this day will be the expected date of birth.
It is worth noting that this method of calculation is best suited for women with a regular menstrual cycle that lasts 28 days.
4 Alternative Ways to Calculate Due Date
- 1. You can find out the due date, with a fairly high accuracy, by visiting the gynecologist's office. The doctor will not prescribe any tests for this, he will simply measure the size of the uterus, which will increase in size in accordance with the age of the fetus. However, this method of calculating the date of birth of the baby is effective only in the first trimester of pregnancy. In the later lines (in the 2nd and 3rd trimester), in each woman, an increase in the size of the uterus occurs with different intensity, depending on the individual characteristics of the organism.
- 2. You can calculate the date of birth by ovulation, which is the most favorable period in which conception is most likely to occur. On such days, a woman usually experiences an increased sexual desire. In addition, her secretions (cervical fluid) become more sticky and thick, basal body temperature rises by a few tenths of a degree, the cervix rises, and the mammary glands thicken and become painful.
In the same way, you can perform calculations on the date of conception. However, you should be aware that this period does not always coincide with the day on which sexual intercourse occurred. Fertilization of the egg, as a rule, occurs only on the third day.
- 3. Hardware calculation using ultrasonic waves can also be attributed to the most effective methods that allow you to determine the term of delivery with an accuracy of 1-3 days. The most correct calculations will be if ultrasound is done during the period of 11-14 weeks of pregnancy.
- 4. To declassify the secret of the date of birth of your child will help his first stirring, which usually occurs on the 20th week (in nulliparous) and on the 18th - in the second and subsequent pregnancy. In ancient times, when there was no ultrasound, this method of calculating the due date was almost the only one.
The effectiveness of hardware methods in calculating the term of labor
A study of the fetus in the third trimester on an ultrasound machine allows you to determine the date of pregnancy with high accuracy, and hence the expected date of birth. The fact is that only with the help of ultrasound diagnostics, the doctor can observe the condition of the placenta, the position of the baby's head in relation to the entrance to the small pelvis, the level of opening of the cervix, signs of fetal maturity, as well as many other important factors. All these parameters are decisive in determining the readiness of the future baby and his mother for childbirth.Deviation from the deadline - is it the norm?
As mentioned above, all calculations of the estimated date of birth are nothing more than an approximate guideline, which should not be heavily relied upon. According to statistics, only 17% of women give birth on the appointed day, while the remaining 83% - either earlier or later. Thus, we can conclude that no specialist, no matter how smart and skilled he may be, is able to predict with high accuracy the date of onset of labor activity.Normally, childbirth can occur between 38 and 42 weeks. pregnancy. The birth of a child will not be premature or belated, but normal and physiological. Sometimes, for certain reasons, labor can begin prematurely. This happens due to deviations in the development of the fetus, stressful situations, various pathological processes occurring in the mother's body, hereditary factors, etc.
Often there is a re-carrying of pregnancy due to the fact that in the first trimester there were any complications. In addition, maternal heredity should be taken into account. If your mother and grandmother gave birth much later than the due date, then most likely the same thing awaits you. Therefore, it is very important to realize that the calculation of the term of childbirth is a very complex, conditional and individual issue for each expectant mother.
How do the features of the menstrual cycle affect the date of birth?
The length of a woman's menstrual cycle also affects the duration of childbirth. For example, if it exceeds the standard twenty-eight days, then most likely the pregnancy will last more than forty weeks, and vice versa. However, in this case, the deviation in one direction or another usually does not exceed 5 days. It is worth noting that errors are often made in such calculations, since very often ordinary bleeding is taken for menstruation, which opened after the fertilization of the egg.Maria Sokolova
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As soon as 2 long-awaited stripes appear on the test, and the state of joyful shock passes, the expectant mother begins to calculate the time by which the little one should be born. Of course, knowing exactly the day of conception, it is not difficult to determine the approximate day of birth, but if there is no such data, it remains to rely on the existing traditional "calculators". It is clear that the gestational age is almost impossible to calculate to days and hours (too many factors affect pregnancy), but there are still methods for calculating the most accurate period.
Calculation of the obstetric gestational age by the date of the last menstruation
At a time when there were no high-tech diagnostic methods, doctors used the method of determining the gestational age by “critical days” for such calculations. What is called "obstetric period" in medicine. The method is successfully used today, and involves the calculation of the period (which is 40 weeks) from the 1st day of the last menstruation.
The obstetricians determine the date of birth in the following ways:
- Date of the 1st day of the last menstruation + 9 months + 7 days.
- Date of the 1st day of the last menstruation + 280 days.
On a note:
This time frame is approximate. And only one out of 20 mothers will give birth clearly in the week that was calculated by the gynecologist. The remaining 19 will give birth 1-2 weeks later or earlier.
Why can the "obstetric" term be erroneous?
- Not every woman has "critical days" - regular ones. The cycle and duration of menstruation is different for every woman. One has 28 days and regularly, without failures, while the other has 29-35 days and "whenever they want." For one, the torment with menstruation takes only 3 days, while for the other it takes a week, or even one and a half.
- Conception does not always occur exactly at the moment of sexual intimacy. As you know, a sperm cell is able to live for several days (or even a week) in the fallopian tube, and on which of these days fertilization occurred - no one can guess and cannot establish.
How to calculate the gestational age by the first movement of the fetus?
The oldest, "grandmother's" method for determining the gestational age. It cannot be attributed to the most accurate, but together with other methods - why not? The term of the 1st stirring of the crumbs is still noted in the history of the pregnancy of the expectant mother.
It's simple: the 1st movement is exactly half the term. For the 1st birth, this usually happens at 20 weeks (i.e. 1st wiggling date + 20 more weeks), and for subsequent births, at 18 weeks (1st wiggling date + 22 more weeks).
However, it should be remembered that…
- The expectant mother will not even feel the true 1st movements (the baby begins to move as early as the 12th week).
- Often, for the 1st stirring, mothers take gas formation in the intestines.
- A thin, slender mother with a sedentary lifestyle is likely to feel the first points much earlier.
Given the inconsistency of this method for making important decisions about the timing of childbirth, relying only on it is not only naive, but also dangerous. Therefore, determining the date of birth can only be complex. That is, adjusted on the basis of all factors, analyzes, diagnostics and other indicators.
We calculate the gestational age and the date of birth by conception on the days of ovulation
The easiest way to calculate your gestational age is to use the days of ovulation in your calculations. Most likely, pregnancy occurs on the 14th day of the 28-day cycle (or on the 17-18th day with a 35-day cycle) - this day is the starting point for the gestational age. For calculations, you only need to subtract 13-14 days from the date of the missed period and add 9 months.
The disadvantage of the method is the low accuracy of forecasts:
- 1st reason: the period of sperm activity (2-7 days) in the fallopian tube.
- 2nd reason: it is difficult to determine the approximate day of conception if the spouses make love several times a week or more often.
How do obstetricians-gynecologists calculate the gestational age?
On the first visit of the expectant mother with an embarrassed “I'm probably pregnant”, the gynecologist, first of all, is interested in the date of the last menstruation. But the gestational age will be calculated, of course, not only on its basis, but in a complex way.
The "package" of such factors and criteria includes the following methods:
According to the size of the uterus
An experienced doctor will very quickly and clearly determine the term in this way, especially in the early stages. For example, during pregnancy up to 4 weeks, this criterion will be equal to the size of a chicken egg, and at the 8th week - the size of a goose.
After 12 weeks, it is already more difficult to determine, because each baby is individual, and the size of the uterus in 2 mothers with the same period may be different.
According to ultrasound
Again, until the 12th week of pregnancy, determining its period is an easier process than starting from the 3rd month.
The error of ultrasound diagnostics from the 2nd trimester is due to the individual development of babies.
According to the height of the fundus of the uterus (VDM)
The gynecologist uses this method starting from the 2nd trimester of pregnancy. In the process of carrying a baby, the uterus grows with him and gradually goes beyond the bottom of the pelvis.
The doctor measures the VDM by laying the expectant mother on the couch - probes the uterus through the abdominal cavity and works with a “centimeter” (from the pubic joint to the highest point of the uterus). The increase in VDM occurs weekly and most often corresponds to certain indicators.
Deviations of 2-4 cm are possible, taking into account the age of the mother, the number of waters and the number of embryos, the size of the baby, etc. Therefore, the obtained indicators must be compared with the size of the fetus and with the circumference of the mother's waist.
VDM - weekly calculation:
- 8-9th week
The uterus within the small pelvis. VDM - 8-9 cm.
- 10-13th week
From the 12th week begins the development of the placenta, the formation of blood vessels in the fetus, the growth of the uterus. VDM - 10-11 cm.
- 16-17th week
The kid is no longer just a "tadpole", but a little man with all the organs. VDM - 14-18 cm. At the 16th week, the doctor is already probing the uterus in the area between the navel and the pubis.
- 18-19th week
Formed placental system, limbs, cerebellum, as well as the immune system. VDM - 18-19 cm.
- 20th week
At this period, the VDM should be equal to the period - 20 cm.
- 21st week
From this point on, 1 cm / week is added. The bottom of the uterus is palpable at a distance of 2 fingers from the navel. VDM - about 21 cm.
- 22-24th week
The bottom of the uterus is already in the navel, and is easily determined by the doctor. The fetus already weighs about 600 g. WDM - 23-24 cm.
- 25-27th week
VDM - 25-28 cm.
- 28-30th week
VDM is 28-31 cm.
- From the 32nd week, the doctor determines the bottom of the uterus already between the navel and the xiphoid process of the chest. VDM - 32 cm.
- By the 36th week, the uterine fundus can already be felt on the line that connects the costal arches. VDM is 36-37 cm.
- 39th week. During this period, the bottom of the uterus descends. The weight of the baby "passes" over 2 kg. VDM is 36-38 cm.
- 40th week. Now the bottom of the uterus can again be felt between the ribs and the navel, and the VDM sometimes decreases to 32 cm. This is the period when the baby is ready to be born.
According to the size of the head and the length of the fetus
For this method of calculating the term, various formulas are used:
- Jordania method
Here the formula is presented as X (term in weeks) \u003d L (length of the child, cm) + C (D head, cm).
- Skulsky method
The formula is as follows: X (term in months) \u003d (L x 2) - 5 / 5. In this case, L is the length of the child in cm, the five in the numerator indicates the thickness of the uterine wall, and the five denominator is the special / coefficient.
Congratulations!
Few things compare to the joy when a pregnancy test shows a positive result! After realizing the wonderful news that you will soon become a mother, you will begin to think about practical issues. One of these questions is how to find out the date of birth?
Start with
Cycle duration 21 days. 22 days 23 days 24 days 25 days 26 days 27 days 28 days 29 days 30 days 31 days 32 days 33 days 34 days 35 days 36 days 37 days 38 days 39 days 40 days
Defining it is not as easy as it might seem. Most moms-to-be don't realize they're pregnant until the first missed period, by which time the pregnancy can be up to five weeks. This means that it is not enough to simply count nine months from the date of the pregnancy test, even if you try and take into account the weeks that have passed since the last ovulation.
It will be possible to determine the exact date of birth of your unborn child only if you remember exactly the day of the ovulatory cycle at the time of fertilization.
HOW TO USE THE CALCULATOR TO DETERMINE THE DATE OF BIRTH OF A CHILD
You may not know that menstruation and ovulation are considered the first two weeks of pregnancy. Therefore, it is not surprising that the calculations can be difficult, especially if your cycle is longer or shorter than the average (28 days).
Although pregnancy usually lasts 40 weeks, the date of delivery can depend on various factors. Our calculator takes into account your last period start date and cycle length to quickly calculate an estimated due date based on your cycle length.
If you know the exact date of conception, enter it. The calculator takes into account the first two weeks that fall on menstruation and ovulation.
- 1.First specify first day of your last period, as well as the average duration of your cycle. This is the number of days from the first day of one period to the last day before the start of the next period. If you know which one the day conception occurred, choose this option as an alternative.
- 2. Enter relevant dates into a calculator.
- 3. Then press To know!
Remember that the calculator calculates an approximate date, not an exact date. After all, every pregnancy is different.
WHAT TO DO WHEN YOU KNOW YOU ARE PREGNANT
Having calculated the date of birth, you will know the approximate date the baby will be born, and you can start preparing for this.
If you haven't already, start by making an appointment with your doctor, who will confirm your pregnancy with a blood test and physical examination, and help you determine a more accurate due date.
At each follow-up visit, the doctor will determine the size of your uterus and monitor your baby's development. The highlights of these examinations will be when you first hear the baby's heartbeat and also when you see it on the sonogram. As your pregnancy progresses, your due date may change.
Remember that throughout pregnancy, first of all, you should listen to the advice of a doctor. However, there are some things you can do yourself. Check out the rest of our website for more information.
The birth of a child is an important and crucial moment in the life of every married couple. Therefore, it is not surprising that parents want to approach the issues of conception and birth as seriously and deliberately as possible. Undoubtedly, future mom and dad are waiting for the baby with great impatience and joy. And they, of course, really want to at least approximately calculate the age of the fetus and know when their baby will be born.
Online pregnancy calculator online
It has become very easy and convenient to monitor your pregnancy by weeks and months, monitor the development and growth of the fetus, calculate the gestational age, as well as the beginning and end of each trimester - an online pregnancy calculator can do this for you. At the same time, he will take into account the features of your menstrual cycle - its duration and start date. Therefore, the result shown by the calculator is quite accurate, although, of course, not one hundred percent.
In addition, to calculate which period will be the most favorable for conception specifically in your case, plan which month of the year it would be better for your baby to be born, and even what gender of the baby to conceive, you can also use the online pregnancy calculator.
Pregnancy calculator: calculate
As you know, pregnancy lasts an average of about 40 weeks. You need to start the calculation from the first day of the last menstrual cycle - at this moment a new egg begins to mature, which, if successful (if it meets a mobile healthy sperm), will be fertilized shortly after its release from the bursting follicle. Conception can occur approximately on the fourteenth day of the menstrual cycle, that is, during the period of ovulation.
In the calculator, according to which you calculate the pregnancy, the date of the beginning of the last menstruation is entered. It is important for a future mother to know that the due date cannot be calculated with an accuracy of one day, the pregnancy calculator is set up by weeks. However, such accuracy is enough for the mother to have time to tune in, monitor her health and give birth to a healthy and strong baby.
Use the tips that we have posted for you on our website to calculate the pregnancy calculator. We have a weekly pregnancy calculator for expectant mothers, photo and video materials about the peculiarities of the course of pregnancy at various times. This information will certainly be interesting and useful for you.
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