This can affect the calculated length of pregnancy. However, adding 9 months is also problematic, as not all months have the same number of days. Naegele’s rule was therefore interpreted differently by physicians until the beginning of the 20th century, when American medical books specified that the 7 days should be counted from the first day of your last period. However, the rule doesn’t specify whether to start on the first or last day of your period. This method was developed by a Dutch physician in 1744.Īccording to the original rule, you must count 7 days from your last menstrual period and add 9 months to calculate your due date. In the past, most doctors and midwives used Naegele’s rule to calculate a woman’s expected date of delivery. By then, it’s usually safer to induce labour than to wait. Doctors will usually offer to induce labour between weeks 41 and 42. In theory, however, no pregnancy will exceed 42 weeks and 6 days (300 days). Some women may also have a longer pregnancy: the same study revealed that about 25 percent of women having their first baby give birth after 41 weeks and 2 days (289 days). For a second pregnancy, delivery usually occurs around 40 weeks and 3 days. About 50 percent of first-time moms give birth after 40 weeks and 5 days (285 days). However, some studies now suggest that a normal pregnancy may actually last a little longer. Specialists estimate that a pregnancy generally lasts 40 weeks (280 days). How reliable is the estimated delivery date?Īfter a positive pregnancy test, the question on many women’s minds is: what’s my date of delivery? Determining a specific date, however, is more complicated than you might think.
How do I calculate my due date? Determining a specific date is more difficult than you might think.
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