![]() In some relationships, a couple’s physical proximity, let alone their intercourse habits are sporadic and irregular. Sometimes it is possible to estimate the due date based on the conception date if intercourse has been infrequent. For example, if a mother’s period started on December 1st, then three months back is September 1st + 7 days = due date of September 8th. It’s important to remember that every mother is different and her baby’s development towards maturity is dependent on lots of factors, not just calendar days.Īnother way of estimating a baby’s due date is to count back three months from the first day of the last normal period and then add seven days to this. It is also usual practice to refer to the due dates as the Estimated Date of Confinement (EDC), or the Estimated Date of Delivery (EDD). This is because most soon-to-be mothers start counting the weeks of pregnancy from the time of the last period, rather than two weeks later when conception is most likely to have occurred. Interestingly, although most think that pregnancy lasts for 9 months, it really is closer to 10 calendar months. Typically, a pregnancy lasts somewhere between 38 and 42 weeks, which is why 40 weeks (280 days) is seen as the norm. If a woman has undergone IVF, it is easier to predict the baby’s due date as certain factors become clearer:Įxactly when the embryo was implanted into the womb.īlood tests measuring a mother’s hormonal levels could serve as another way to estimate the stage of her pregnancy. This is why it is important to take individual factors into account when estimating the baby’s due date. However, many women have menstrual cycles which are a few days longer or shorter than this. This is dependent on a mother having a normal 28 day cycle, assuming that conception occurred around 14 days after the start of her period. The baby’s gestational age is estimated by calculating the first day of the mother’s last normal menstrual period and then adding 40 weeks to this date. A pregnancy calculator provides a good estimate of the due date based on a mother’s menstrual history, rather than when actual conception has occurred. When conception has occurred naturally, estimating the baby’s due date is generally done in the same way around the world. Knowing the exact moment when the sperm fuses with the egg, however, is impossible. Based on this, a more accurate estimation of due date based can be made. The closest we can get is to pinpointing exactly when conception has occurred, is when a woman has undergone in vitro fertilisation (IVF). We have created a slew of pregnancy calculators and tools to help you through your pregnancy.No matter how much planning goes into conceiving a baby, it’s important to remember that pregnancy is not an exact science. Pregnancy Calendarįollow your baby's development week by week in our article series. If you want to, you can view a sample due date report. Timeline of Significant Milestones in Embryo/Fetal Development.Due Dates for Multiples (Twins, Triplets, Quads).Each due date report contains the following data: A normal pregnancy can last anywhere between 38 and 42 weeks. Most are born within a week either side of the estimated due date. On average only 5% of births take place exactly on the estimated due date. Be sure to talk to your health care provider about your due date. Every pregnancy is unique and your baby will come when it's ready. Please remember that your due date is only an estimate. If you deliver on your due date, your baby is actually only 38 weeks old, not 40. Note that your menstrual period and ovulation are counted as the first two weeks of pregnancy. Your due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (assuming a 28 day cycle). Pregnancy induced hypertension How is my due date calculated? ![]()
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