head circumference - starting to freak out

[PumpkinZulu]

I don't think you need to worry. The measurements are just guesses, and any estimations they do based on those guess will be even more off. DD's HC was 36.5, and guess what? Didn't tear, not even a tiny bit You'll be able to fit your baby out, very few circumstances arrive where there may be difficulty in achieving that. Try not to stress about something that will likely not even be an issue

[boomba]

Hugs Hun its hard nice you get to the end and start thinking about how on earth this baby will get out!

Bubs head has 3 plates which all overlapp as they start to move down the birth canal and when you finally push them out. So it's actually smaller then the plates move out and then you will see the head circumference.
Also ultra sounds are not 100% correct. So try not to judge it too much on that!
Have you watched many birthing videos? Check them out they may hel you prepare

Your body is amazing and it will be perfect birthing your baby! Good luck Hun you will be fabulous xxx

[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.