Like one poster mentioned nature and evolution do not care about how much pain we feel. The only experiences that evolution will change are things that result in no offspring.
If the pain always resulted in failure to give birth and only the women who had pain free births were able to have children then eventually the genetics to have pain free births would dominate.
There was one period not too long after the first humans arose in Africa, where a long drought and climate change killed off most humans. At that point only the strongest and smartest were surviving. That was a big evolutionary shift for us.
Scientist have found large eggshells from that time, buried in the ground with small holes poked out on top to be used as water storage. Clever.
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