C-Sections Caused an Evolutionary Change
The female pelvic canal is not so well designed for giving birth compared to other primates. Therefore obstructed labour used to be a high death factor. Luckily, the introduction of Caesarean section in the fifties saved the life of many mothers and babies. Though C-section has an unexpected side effect on human evolution: newborn heads are getting bigger, while the mothers birth canals are becoming smaller.