Is the average size of the human head increasing?

I don’t know of any such study. But, I can think of two reasons for the increase in C-sections that aren’t related to increasing head size.

  1. Women with small pelvises died as a consequence of the first birth so never gave birth again. With the advent of safe C-sections they now can go on to have more children.
  2. Since C-sections have become safer doctors are more willing to do a C-section when a labor goes long.

Speaking of evolution though, Neanderthals had larger heads than moderns do. It is also probable that their pregnancies lasted up to 10 months so the infant was better able to survive the cold. So head size is probably not an indicator of much.

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