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1-4 weeks- Neural tube forms - It will develop into the nervous system. Brain, spinal cord, hair, and skin. Heart and primitive circulatory system rapidly form - While still in its beginning stages, this is the very life support system.

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11y ago
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12y ago

in most cases its the head (in cephalic presentation) or the legs can come out first (in breech presentation)

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Q: What was the first part of a baby that will develop?
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