Gestation - Humans

Humans

Human pregnancy can be divided into three trimesters, each three months long. The first trimester is from the last period to the 13th week, the second trimester is from the 14th to 27th week, and the third trimester is from the 28th week to 42 weeks.

In humans, birth normally occurs at a gestational age of about 40 weeks, though a normal range is from 37 to 42 weeks.

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