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Monthly menstruation instead of annual heat a sign of domestication. Women need so much help for childbirth because our brains go larger so fast in the last few thousand years. Concious evolution (intelligent mate selection) have been used by humans instead of natural evolution for tens of thousands of years by this point. It's not necessarily a problem until standards of reproduction are reduced, which they have been. Now you have a majority of women birthing by c-section and feeding babies by formula. Now we're becoming dependent on those things to have kids at all, which is a disaster. If denied access to a hospital, now a woman is likely to die in childbirth because she can't do it without medical intervention.
It's a eugenics disaster and the result of unthinking altruism over the course of generations.