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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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Heart Development


3 weeks

Source: University of Illinois at Chicago.
All ages referenced to fertilization, not last menstrual period.
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The Folding of the Embryo
The Folding of the Embryo
The Folding of the Embryo
The Folding of the Embryo
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
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