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Baby’s Pregnancy Calendar |
The Heart in Action 4 weeks old / 6 weeks pregnant (since LMP)
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Script: The heart typically beats about 113 times per minute. Note how the heart changes color as blood enters and leaves its chambers with each beat. The heart will beat approximately 54 million times before birth and over 3.2 billion times over the course of an 80-year lifespan. |
| See Snapshots |
The Heart in Action
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Hand Plates and Cartilage
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Hand Movement
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Fingers and Toes
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Spontaneous Movement
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Reflexive Movement
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