Charlie's head circumference was 39cm, and my Dr and midwives all commented about how his head didn't go all conical despite a vaginal birth. He definitely felt bigger as far as pushing him out was concerned, but I still managed to, with only the slightest of tears.

My Ob laughingly told me later that birthing a baby with a HC of 39cm was like birthing a 10lb baby. And all I thought in response to that was that it didn't matter, all I cared about what that I still managed to get him out. Lol!