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How can you calculate the due date in pregnancy?

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DzooBaby 10 Jul 2012

Count 3 months backward from the date of the start of the last menstrual period. For instance, if the last period started June 24th then the due date is approximately March 24th. Gestation for human babies is approximately 40 weeks give or take a week or two either way. This calculation is a rough estimate. Once the fetus is large enough to measure during ultrasound, they may then change the date accordingly.

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