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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Having a “den” or “pack” that allows newborns to grow more and be protected by the group makes this possible. If we did not nurture babies together and left a mother and baby on their own survival would be rare and we would never have been able to evolve the larger brains.
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