Fetal Development Weeks 9 Through 13

Week 13

Welcome to the final week of the first trimester! By the end of this week, your baby is about three inches in length, and would fit cozily into the cupped palm of your hand. Although you can't feel his movements, he's all over the place at this point, arms and legs waving, body wriggling. Sometimes he gets the hiccups. Though he may seem agitated, he's really just feeling his oats, testing his brand-new powers of motion while he still has the room -- by the end of the next trimester, his living space will be much more cramped.

External sexual organs are beginning to emerge now, with clitoris and labia developing in girls, penis and scrotum in boys, but these organs still aren't detectable by ultrasound.

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Reviewed 2008

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