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The Endowment for Human Development
The Endowment for Human Development
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Embryonic Development


3 weeks

Source: University of Illinois at Chicago.
All ages referenced to fertilization, not last menstrual period.
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Heart Development
Heart Development
The Embryo and Yolk Sac
The Embryo and Yolk Sac
Embryonic Development
Embryonic Development
Sections of the Brain
Sections of the Brain
Body Cavity Formation
Body Cavity Formation
Amniotic Fluid
Amniotic Fluid
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