How children Bron?It is necessary to kept it for 9 months.
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- Baby heads and pelvic width Anthropologists have theorized that evolution has made a trade-off between big baby brains and the narrow pelvises needed for bipedal walking, resulting in babies born earlier than the ideal.
- Human babies are born helpless and needy, a fact that anthropologists have long explained by pointing to the size of the female pelvis. If babies were born with bigger brains, the theory goes, they'd get stuck in the birth canal.
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