Head Too Big To Fit

10 Replies
Madeleine - May 5

Just had u/s at almost 36 weeks to measure growth. Head diameter already 9.5cm with 4.2wks to go. If I only dilate 10cm and it's likely to grow 1cm more to 40wks, can I deliver naturally? Anyone had baby va___ally with head +10cm?? Thanks


AppleCake - May 5

When they measure the head on u/s they measure around the largest part- as if you were looking straight down on top of baby. When baby is born, the presenting part is more to the back of the head where it is much narrower. Plus, the bones in baby's skull all move and squish together to fit through. My babies heads measured 10-11cms at a 38 week ultrasound. They were both born v____ally 2 weeks later after 2 hours of labour. If the docs thought your baby was excessively large or you were excessively small I'm sure they would tell you. Don't worry about it!X


bean - May 5

AppleCake (yummy!) is right. The bones in a baby's head are soft (aka the soft spot) and the plates are meant to slide under one another to create a really small diameter that you push out. There's rarely a chance that the head would be too big to come out (but sometimes the shoulders might pose problems). That's why babies are often born with cone heads, which reshape themselves a few days after birth. Definitely don't worry about your baby being too big! If babies were too big for women to deliver, none of us would be here (c-sections weren't a trend 30 years ago).


Madeleine - May 5

Thanks ladies. All the measurements are big for 36 weeks (would be normal size for 40wk) and I was only 117lbs before I got pregnant, so I was worried to see the head was on the MAX "normal" side, since the estimated weight is already nearly 7lbs!


mayaB - May 5

Madelein, I'm in the same boat. I was about 100 lbs and 5'4 tall before pregnancy, and I'm pretty small all around. The baby has been measuring very very big since week 30 and I'm now 38 weeks. This wednesday I'll be going in for a consultation at the hospital (till now I've been seeing my doctor privately) and they'll decide what the likelyhood is of my having problems getting him out v____ally. I'd rather have a csection to start with, than go through labor and then find out at the last moment they're going to csection me!


Madeleine - May 5

HI MayaB - let me know what they say. I really DONT want a c-sec so am hoping if it looks too big for me, I can persuade them to induce me early. Good luck :)


Alycia - May 5

Madeleine and mayaB - I thought you might find my mom's experiences encouraging. Before she got pregnant (both times) she was just shy of 5'4" and 107 pounds. I was born at 36 weeks weighing 8 lbs 9 1/2 oz and my brother was born at 40 weeks weighing 10 lbs. I don't know the exact size of his head, but I know that the doctor was shocked by its size - our pediatricians always commented on the size of his head during our checkups as children, too. My mom had NO contractions until she was FULLY dilated! Then she pushed him out in 45 minutes. If she can do it, I'm sure many others can too. Try not to sweat it too much.


Alycia - May 5

To clear up my mom's birth a bit: Her water had broken three hours earlier, and her nurse was wanting to check her to see if she was dilating at all. That's when it was discovered that she was at 10 cm, and as soon as they told her that, she started having contractions! Wild, isn't it? I hope I'm like that!


luvmyboys - May 7

My almost 4-week-old son's head diameter was 12 cm. I am not a large person, usually 130 lbs and 5'4'' and he was 10 lbs at birth. It can be done! But he was also my third baby. Just be glad they measure and weigh the baby after you have it and not before. It's a good thing we don't know what's coming!


Jilloh - May 7

my son's head was 14 1/2 inches and it was no problem


Evonna - May 7

I hope you meant 14 1/2 cm Jilloh because that's a huge head, lol.



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