How To Calculate Due Date – Knowing your estimated delivery date (EDD) (also known as estimated delivery date or simply due date) can only give you a rough idea, but it’s not 100% reliable. This is because most babies are usually born early or late, so the percentage of babies born on their due date is very low.
There are several ways to determine the approximate due date, even if it’s not your baby’s birthday. However, the dates serve as a guideline for you and your family.
How To Calculate Due Date
The last menstrual period (LMP) is not only an important date for calculating gestational age, but also the information an ultrasound scan can provide about your baby’s development.
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Below is an index that summarizes the 7 points we will share in this article.
Generally, it makes sense for women to get pregnant during their last ovulation. However, remembering this date is much more difficult than the last menstrual period.
If a pregnant woman knew the date of her last ovulation, the duration of her pregnancy would be 266 days, that is, she would be 9 months, that is, she would be 38 weeks.
On the other hand, if you do not remember exactly the day of your last ovulation, then the day of your last menstrual period is taken into account from the first day of menstruation. Therefore, the gestation period is said to be 40 weeks or 280 days.
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The difference between 38 and 40 weeks is due to the 14 days from the first day of menstruation to the moment of ovulation, when the egg is ready for fertilization. Therefore, the pregnancy period also changes depending on the due date.
In any case, even if the exact date of conception is known with absolute certainty, the date of birth remains a mere guess.
Pregnancy is the period from conception to birth, during which the baby grows and develops inside the pregnant woman’s body.
, a concept expressed as the number of weeks from the first day of a woman’s last menstrual cycle to the current date. Therefore, the gestational age of a normal pregnancy will be her 38-42 weeks.
Calculating Your Baby’s Due Date
There are mathematical rules for calculating gestational age, but it is important that a full month has passed. Multiply the number of months of pregnancy by 4 and add 2 trimesters, 3 trimesters, or 4 trimesters, respectively, depending on the length of your pregnancy. 1st, 2nd, or 3rd semester.
For example, a woman who is 5 months pregnant and in her second trimester has a gestational age of 23 weeks (5 x 4) + 3 = 23 weeks.
Receiving a positive pregnancy test is a very joyous moment in your life. In addition, most women want to know right away when they will hold their baby. Therefore, there are different ways to calculate this term.
Expected date of birth Expected date of abortion. Babies are usually born between 38 weeks and 42 weeks of pregnancy. This date is an estimate based on the 40 week difference from the first day of the mother’s last menstrual period. In addition, it is also possible to calculate the due date of birth using ultrasound.
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This calculation is approximate, but it will help you prepare in time for your baby’s arrival.
Naegele’s law is the most commonly used method for determining terminology. This is a formula that consists of adding her 7 days and 1 year (if necessary) to the date of her last menstrual period (LMP) and subtracting 3 months from the month in which the LMP occurred. So the formula becomes:
The figure below shows an example of the application of this mathematical rule. If a woman’s LMP is her May 21, 2019, her EDD is February 28, 2020.
Therefore, Naegele’s rule is a very simple formula that provides a fairly accurate due date. However, for this method to be reliable, the following prerequisites must be met:
Using A Reverse Due Date Calculator
On the Internet, you can use the free tool Calculator to calculate delivery times. All of them must include the date of your last period or the date of your child’s conception. The tool will then automatically calculate her EDD, but as mentioned earlier, it will be in the direction.
After getting a rough estimate using an online calculator, your doctor will give you clear information about when your baby will be born.
The date of birth determined by ultrasound is more reliable than the date of birth based on the menstrual cycle, since it is related to the development of the baby in the woman’s womb.
A few weeks into your pregnancy, your doctor will perform an ultrasound to measure your baby’s size. In this way, experts assess the development status and determine possible delivery dates.
How Many Weeks Pregnant Am I?
The best time to do an ultrasound and find out the due date is between 8 weeks and her 18 weeks. Fetal size is difficult to measure until the 8th week.
This date is actually correct and not the end time date. However, in most cases both dates will match. If not, the most reliable date is the one provided by the ultrasound data.
The main difference between conceiving naturally and through in vitro fertilization (IVF) is the ability to accurately determine the onset of pregnancy.
Assisted reproductive technology allows us to know the exact moment when ovulation or fertilization occurred, as well as the age of the embryo when it was implanted in the woman’s uterus.
Easy Due Date Calculator
In IVF treatment, a woman is given drugs, her ovaries are punctured and the eggs removed, causing ovulation to occur within 36 hours. Therefore, two weeks ago is the theoretical last menstrual date, which helps in determining the date of pregnancy.
On that day, the collected egg combines with the sperm, fertilization occurs, and the embryo is born on day 0. The resulting embryos are grown in a laboratory until they are implanted in a woman’s uterus or frozen.
To calculate the gestation period, consider the day of embryogenesis (union of the egg and sperm) to be her 14th day of the cycle. So, when you transfer the embryo:
For example, if a woman transfers with a 5-day-old fetus on her October 20th, her theoretical LMP would be her October 1st. Therefore, the EDD will be July 8, 2020.
Due Date Calculator
For her IVF treatment with egg donation, it will be the same as the IVF treatment. That is, the time of the donor’s ovarian puncture is considered as her day 0, and the LMP is determined 14 days before her. This allows pregnancy to be simulated naturally.
If you become pregnant through frozen embryo transfer, your gynecologist will accurately calculate the number of weeks of pregnancy, which may not correspond to the time since your last menstrual period. In this case, experts determine the date of the theoretical last menstrual period.
Therefore, if frozen on her 5th day of development, the transition date would be cycle day 19 (14 + 5), and the date of last menstrual period would be set 19 days before her transition. Therefore, the number of weeks of pregnancy is counted from this day.
On the other hand, if the fetus is 3 days old, the transfer date is considered cycle day 17 (14+3).
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, consists of a pregnancy cycle calculator. In this way, you can calculate the woman’s gestational age and expected date of birth.
Knowing your gestational age is important for calculating your due date, but it’s also important to perform a pregnancy test on the appropriate day. In this way, you can check whether the development of the fetus is correct during the gestational weeks.
In singleton or multiple pregnancies, delivery occurs sooner than in singleton pregnancies.
For two babies, the average gestation period is usually 37 weeks. It is also important to know that more than half of twins are born prematurely.
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In order to identify possible changes and prevent them in time, it is necessary to properly monitor the entire pregnancy. For more information, see: How do I calculate terms?
If you want to know more about childbirth, we recommend you to visit the following link: Childbirth: Preparation, types and possible complications
Fouché LC, Kritzinger A, Le Roux T. Errata: Variation in gestational age and birth weight in infants with language impairment in an early communication intervention clinic. S Afr J Communal disorder. 2019 Sep 12; 66 (1): 622. doi: 10.4102/sajcd.v66i1.622.
Husby A, Wohlfahrt J, Melbye M. Gestational age and endometrial cancer risk: a national cohort study. B.M.J. August 2019
