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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Not all other mammals can pop out offspring easily all the time. If you’d ever lived on a dairy farm you’d have seen any number of difficult calvings. It happens.
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