New definition of 'full term' narrows on-time arrival window

By Laura Sanders, 18:34 PM October 24, 2013

To the chagrin of pregnant women terrified of giving birth on a dingy Metro platform, due dates are far from certain. Due dates are also weird: They are calculated as 280 days (or 40 weeks) from the day of a woman’s last menstrual period, rendering a woman officially “pregnant” before she’s even ovulated. The odds of a little bundle of joy arriving precisely on his or her due date are actually pretty low. But thankfully, doctors are pretty good at ballparking the big day.

Until now, babies bor...

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