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The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
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Gender Differences


3 months, 2 weeks

From The Biology of Prenatal Development.Buy Now

Script: Sex-dependent developmental differences appear for the first time. For instance, female fetuses exhibit jaw movement more frequently than males.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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Responds to Touch
Responds to Touch
4D Ultrasound
4D Ultrasound
Gender Differences
Gender Differences
Tooth Development Begins
Tooth Development Begins
Blood Cells and Bone Marrow
Blood Cells and Bone Marrow
4D Ultrasound
4D Ultrasound
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