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Live Action - Did you know? At 21 days, a preborn baby has a heartbeat. At the end of the first trimester, the child has a face, fingers and toes, and a
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JCDD | Free Full-Text | When Does the Human Embryonic Heart Start Beating? A Review of Contemporary and Historical Sources of Knowledge about the Onset of Blood Circulation in Man
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Our Hearts Start Beating Before They're Fully Formed
