Maybe the more difficult occur in areas where death in childbirth is normalized. Any birth canal works if you are ok with mom deaths. Plausible.
Hmm, I wonder who leaves more surviving descendants - a living woman who has more than one child and is alive to feed and care for her young *or* a woman who dies while birthing her one child
Think of the outcome after a few generations with high childhood mortality...
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And with low child mortality, it could go on forever. You would have a successful tribe with a tendency for childbirth deaths. Farm animals are often raised, these days, with zero ability to reproduce on their own...
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