To me mushbrains concept is deceiving. For eons humans have been born with a average size skull that evolved to fit an average sized birth canal. A design by a process of evolution that goes back 100's of thousands of years of humanity and before.
A fetus in nine months has room in the womb and grows accordingly. There's no internal way known that a developing fetus is going to know a delivery will be c-section and then spontaneously grow a larger head. It doesn't exist. Ordering women to have c-sections isn't going to change a nine month development any time soon.
Hopefully the study took note of babies born with larger than normal skulls, which means it was a fluke in the womb. Billions of people born will have all sorts of abnormalities every day somewhere.
muchbrain is full of shit. It's up to the people to find out where he really is going with this nonsense.