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https://spacefem.com/pregnant/charts/duedate2.php
58 rows · But they seem to come around their due dates. In the survey, only 668 out of 15032 (4.4%) spontaneously arrived on the exact day. But if you look around that date, the numbers get bigger fast... 3699 babies (24.6%) arrived spontaneously between 39 weeks 4 days and 40 weeks 3 days.
https://spacefem.com/pregnant/due.php
68 rows · It's based on the idea that the average pregnancy lasts 40 weeks with a standard deviation …
https://www.bbc.com/news/magazine-31046144
In the UK, where Chaney and Marshall live, a woman's estimated date of delivery is first calculated by using the date of her last period and adding 280 days, or 40 weeks.
https://expectingscience.com/2014/09/29/your-due-date-is-wrong-so-when-is-labor-really-most-likely/
Sep 29, 2014 · Yes, the due date is not a precise date, only an estimate. And yes, most women will deliver within 2 weeks of their so called “due date”. But the due date has bigger problems. Actual birth data, from real pregnant women,...
https://sciencestoriesetc.blogspot.com/2010/12/distribution-of-actual-births-around.html
Dec 28, 2010 · The width of the normal distribution was 1.5 weeks, centered at 39.5 weeks. This seems consistent with several sources that suggest ~10% of pregnancies would go into the 42nd week if they were allowed to. It also suggests that the "due date" means the mean of the normal portion of the distribution.
https://en.wikipedia.org/wiki/Expected_date_of_delivery
The estimated date of delivery (EDD), also known as expected date of confinement, and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. Normal pregnancies last between 37 and 42 weeks.
https://www.quora.com/What-is-the-distribution-and-standard-deviation-of-predictions-of-childbirth-due-dates
Jun 15, 2016 · The unborn baby spends around 37 weeks in the uterus (womb), but the average length of pregnancy, or gestation, is calculated as 40 weeks.
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