Length of Human Pregnancies Can Vary Naturally by as Much as Five Weeks
Aug. 6, 2013 — The length of a human pregnancy can vary naturally by as much as five weeks, according to research published online August 7 in the journal Human Reproduction.
Normally, women are given a date for the likely delivery of their baby that is calculated as 280 days after the onset of their last menstrual period. Yet only four percent of women deliver at 280 days and only 70% deliver within 10 days of their estimated due date,
Length of Human Pregnancies Can Vary Naturally by as Much as Five Weeks Read More »