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Nine months is about 274 days (273.9 on the average). Full term human pregnancy averages 40 weeks (280 days) from the last menstrual cycle, which is 266 days after conception, plus or minus 14 to 16 days. 80% of pregnant women have their baby somewhere between 250 days after conception and 282 days after conception.

Also, because calendar months vary in length, not every distribution of 9 months adds up to 274. From January 1 to September 30, there are 273 days in a non-leap year (leap year does have 274 days). Same for February to October. However, removing February and replacing it with November yields an extra two days, or 275 days. Going from May 1 to January 31 yields the most days, 276.

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11y ago

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