Pregnancy dating date conception
This is also defined as 280 days, or 40 weeks, from the first day of the mother’s last menstrual period, a definition which assumes that the mother ovulates on day 14 of a 28 day menstrual cycle. In the 1980’s, Mittendorf noticed that birth dates for women in his practice, primarily second-generation Irish-Americans, averaged seven days past their “due dates”.He reviewed his records, then went on to review records of 17,000 births, and determined the average healthy, white, private-care, primiparous woman averaged 288 days from LMP to birth: 8 days longer than Naegele’s rule.
Klimek has an evenly distributed Gauss curve, or bell curve, but does not substantiate it with empirical data.Because visual representation of data is often helpful for illustrating a point, I have included a graph here illustrating the range of dates at which babies are born.The following graph is intended as an illustration of approximately how many births occur within each week of pregnancy.Some parts of popular culture, like baby betting pools, remind us that the date is difficult to guess; however, other messages imply that we can expect a certain date. there is a token message there saying something like “baby’s not here yet?
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Well, take care of yourself and be patient.” But clearly the message is to expect the baby then, despite the fact that only 4-5% of babies are born on their exact due date.
Therefore, my data for weeks 40 and 41 are only estimates, based on a bell curve format.
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