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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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Body Cavity Formation


4 weeks

Source: University of Illinois at Chicago.
All ages referenced to fertilization, not last menstrual period.
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Embryonic Development
Embryonic Development
Sections of the Brain
Sections of the Brain
Body Cavity Formation
Body Cavity Formation
Amniotic Fluid
Amniotic Fluid
The Heart in Action
The Heart in Action
The Limbs Bud
The Limbs Bud
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