Thanks heaps guys.

This stuff is all new to me and its good to know that its normal. My ob kind of scared me a bit when he took the measurement and then said to himself "nah, that cant be right" and then took it again and it was the same.

I guess they are tiny measurements when you think about it but i was driving home yesterday thinking that im going to give birth to some mutant thing with this MASSIVE head and tiny little body!