It will take mostly 38 weeks (266 days) for babies to develop fully in the womb. The due date is the day where the mother will expected to give birth based on this 38 weeks gestation process.
But keep in mind that the doctor will consider a pregnancy to be full-term anywhere from 37 to 42 weeks of gestation. Babies can be born at any time, and some factors will play a role in decide when the mother go into labor and when the baby will be born.
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