Today I read a very interesting article. It seems that the theory that human babies are born earlier in their development than primates and other mammals because we walk upright is not seen as correct anymore. The new theory shows that it has to do with the metabolism. To be that rings more true than the older theory.
Here is a bit of the text, below you will find the link.
Long-held theory on human gestation refuted: Mother’s metabolism, not birth canal size, limits gestation
August 27, 2012
University of Rhode Island
An anthropologist suggests that the length of human pregnancy is limited primarily by a mother's metabolism, not the size of the birth canal. The research challenges the long-held notion of an evolutionary trade-off between childbirth and a pelvis adapted for walking upright.
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