Naegele's Rule is a standard way of calculating the due date for a pregnancy. The rule estimates the expected date of delivery (EDD) by adding one year, subtracting three months, and adding seven days to the first day of a woman's last menstrual period (LMP). The result is approximately 280 days (40 weeks) from the LMP.
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“The condition that gives birth to a rule is not the same as the condition to which the rule gives birth.”
—Friedrich Nietzsche (1844–1900)