Seems to me that even with our advances we suffer from an excessive amount of complications for a natural act.
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There’s two reasons for this that occurred during our evolution. The first is brain size. We have larger brains which means a bigger head. Now this is partially made up for by having pieces of our skull unfused at birth. The second and probably more important reason is due to the pelvis evolving for upright walking. The pelvis is more narrow which leads to a smaller birth canal.
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