Due date calculator

Pregnancy usually lasts 280 days (40 weeks) from the first day of the woman’s last menstrual period. Here’s a link to our interactive Due Date Calculator that will help you estimate the date your baby will arrive.

Remember, though, that this calculator is a general guide: every pregnancy is unique, and sometimes babies arrive sooner or later than expected. Always talk to your health care provider about your due date. And be sure you know the signs of preterm labor and what to do, just in case.

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2 Responses to “Due date calculator”

  1. CP Says:

    Whoa! That first sentence is very misleading. The perception that “pregnancy usually lasts 40 weeks” can be dangerous–first, it’s inaccurate, and, second, it makes moms more susceptible to suggestions or the idea that they should do something to “move along” a healthy pregnancy that goes beyond 40 weeks. Full term is up to 42 weeks and *pregnancy in first-time moms averages 41 weeks and 2 days*. In all pregnancies, more than half of mothers will give birth after 40 weeks if undisturbed.

    With the current trend in non-medically indicated inductions in the U.S. complicating births and pushing up our C-section rate, we need to start correcting the harmful misperception that there is any precision to calculating Estimated Due Dates or that babies “should” be born at 40 weeks.

    Thank you.

  2. Lindsay Says:

    Hi CP – You’re right that although we aim for about 40 weeks, pregnancy length varies. This is why we said the due date calculator gives an estimate, it’s a general guide, and that every pregnancy is different, some earlier others later. You’re also right, and we’re totally with you here, that the non-medically indicated induction and cesarean rates in the US have gone up dramatically. That’s why in much of our material we say if your pregnancy is healthy, it’s best to let labor begin on its own.

    We really appreciate your taking the time to send your comments.

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