Due date or due month?

Posted by on Aug 7, 2013 in News/Articles, Pregnancy | 0 comments

Due date or due month?

For years we’ve been given a ‘due date’ by our obstetrician and we begin planning for the exciting day.  However should perhaps ‘due dates’ should perhaps be changed to ‘due months’?  New research shows that due dates can vary by up to 5 weeks.

“We found that the average time from ovulation to birth was 268 days – 38 weeks and two days,” Dr. Anne Marie Jukic of the National Institutes for Health, said in a press release. “Even after we had excluded six pre-term births, we found that the length of the pregnancies varied by as much as 37 days.”

Due dates are calculated to be 280 days after the first day of your last menstrual period, but new research shows that this is only accurate in 4% of cases.

Researchers identified many reasons for the large variation in pregnancy timing including factors such as the embryo taking longer to develop from implantation to delivery, resulting in a longer pregnancy whereas a late rise in progesterone resulted in a significantly shorter pregnancy.  Other factors included mothers age and their own birth weight as well as the length of any previous pregnancies.

For more information see Discovery News


Image courtesy of Stuart Miles/ FreeDigitalPhotos.net

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