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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Evolution doesn’t choose where to change things, it changes random things and the benefits can cause more reproduction among creatures with those traits; natural selection, and survival of the fittest.
In humans, it was intelligence that was evolved, but that costs more time and energy to reproduce. However, it was intelligence that allowed us to live longer in order to further develop humans with even more capability for intelligence.
Of course, this happened over millions of years, but that’s how we got here. In the wild we were weak, but our intelligence paved a way to survival. Not to mention bipedalism, which allowed us to run for miles without even breaking a sweat. Combined with our intelligence, we could run animals off cliffs and we would have spent much less energy for much more reward…
And the cycle continued. Evolution didn’t directly change the way we reproduce because we were living much longer with intelligence and bipedalism, and as a result we kept those traits.
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