head circumference - starting to freak out

[Trillian]

I second what Boomba said. Mother nature knew what she was doing when she made baby's head with 3 plates in it My first baby was born with spectacular moulding of his head - he had this huge cone shaped head when he was born because of all the moulding. His HC at birth was 35cm. But at his first check up post birth is was 40cm. No way known could it have grown that much in such a short time.

[onthefly]

As others have said, the head squishes down - it's designed that way on purpose.
My 2 were born with HCs of 35cm and 37cm. They come from a long line of big heads (In fact, I'm rather proud of the fact that my daughter's head is the average size for a 3 year old)

The other thing to remember, is that scans are notoriously inaccurate. It's quite plausible that your baby is perfectly well formed, growing well and will be the right size for you to birth.