An Evolutionary Explanation for Higher Rates of Birth by Caesarian Section?

Researchers writing in the Proceedings of the National Academy of Sciences contend that higher rates of babies being delivered by Caesarian section have an evolutionary explanation. The BBC reports:

Caesarean births 'affecting human evolution'

The regular use of Caesarean sections is having an impact on human evolution, say scientists.

More mothers now need surgery to deliver a baby due to their narrow pelvis size, according to a study.

Researchers estimate cases where the baby cannot fit d...