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Foetal Development and Trimester Stages
Unit: Reproductive System

Foetal Development

Foetal development takes a total of 38 weeks to 40 weeks, so in obstetrics (the care of women during pregnancy and childbirth) this period of time is split into 3 calendar months. These are known in order as the first trimester, the second trimester and the third trimester.

The Trimesters

Roll over each image to reveal information about the trimesters.