QUESTION:
"I'm a little confused about my due date. I figured out a due date online using the day that I think I conceived. Then yesterday, at my first prenatal visit, my doctor asked me about my periods and then used a plastic wheel to come up with a date, which was a few days off from what I had come up with. Then she sent me for an ultrasound and it came up with another date, a few days off in the other direction. How do I know what my real due date is?"
ANSWER from Judith Lothian, RN, PhD, LCCE, FACCE, co-author of The Official Lamaze Guide: Giving Birth with Confidence, 2nd edition:
Your estimated due date is just that—an estimate. It is calculated by adding 40 weeks to the date of your last period, and assumes that you have a 28-day cycle and your baby was conceived around day 14. Since this isn't true for many women, we always say that the due date is not exact. Calculating a due date based on when you conceived or based on an early ultrasound may give different dates, but these are still estimates. Your baby may be quite ready to be born up to two weeks earlier than your estimated due date, or two weeks later. Only your baby's birth day is your real due date!
Many babies take more or less than 40 weeks to be ready for the outside world. In fact, only 5 percent of babies are born on their estimated due date. Imagine making a batch of popcorn. Most kernels pop during a few noisy moments. But, there are lots of early and late poppers, too. All the popped kernels are perfect—but each needs a slightly different amount of time to be fully cooked. The same is true for babies!
By adopting a relaxed attitude about your due date in early pregnancy, you're practicing patience and trust that will serve you well as your pregnancy progresses. More than likely, you will go into labor only at the right time for you and your baby.
Judith Lothian is a childbirth educator and an associate professor of nursing at Seton Hall University. Judith writes and lectures on issues related to birth, breastfeeding and childbirth education. She is the associate editor of The Journal of Perinatal Education and co-author of The Official Lamaze Guide: Giving Birth with Confidence, 2nd edition.
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