Is it because of the whole big head/bipedalism thing? Other mammals can pop out babies in no time and it seems like that would be way more advantageous for multiple reasons (less stress on mom and baby, not in a vulnerable position for hours in the wild, etc). Why does the norm skew towards a day rather than hours?
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Are ancestors would just squat down and deliver the baby, often by themselves. Death for the mother, child, or both during childbirth were common.
Now death during childbirth is rare because of helpers, tech, and medicine.
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