Baby’s head circumference crossed over 2 percentiles

[Rswain123]

My 11 month old daughter has recently had an MRI for her rapidly increasing head size. At birth she was on the 9th percentile, at 6 weeks she was 50th percentile and at 10 months greater than 99th percentile. I’m based in the UK so head circumference isn’t routinely measured over here. I brought it up at my daughter’s one year health visitors check. Her weight is on 75th centile. She has no other symptoms, developing normally (except she isn’t able to weight bear on her legs which she had an x-ray for to rule out hip dysplasia which came back clear). She has a prominent forehead which looks like frontal bossing to me. My husband and I both have large heads in our family - but I am concerned about such a drastic increase in her head size in a year. I’m just so worried and need to get the results back from the MRI asap. Does anyone have any experience with this?

I remember someone once telling me head size is quite hereditary, so if you and your husband both have larger head sizes, sometimes babies follow suit...? Hopefully someone will be along in a minute who actually knows something. X

My family hat buying experience would say head size is genetic, but we’ve all had socking massive heads the whole way through rather than rapid growth.

We had this recently including the MRI; baby had gone from 9th to 75th centile, and my family actually all have quite small heads! I was terrified honestly, but the MRI was normal. Just a big headed baby it seems! And almost every single account I've read online had the same outcome.

My DC got as far as seeing a paediatric neurologist who decided no MRI required - it's benign familial macrocephaly. DCs height and weight have both caught to great circumference now at 15 months, but we were worried at six months.

Hi did you get sorted out for this. Iam going through similar my baby's head has jumped from 75th percentile to 99th, at his 7 week check. He is been referred but I am so worried

Hi did you get sorted out for this. Iam going through similar my baby's head has jumped from 75th percentile to 99th, at his 7 week check. He is been referred but I am so worried

ETA: didn't realise that this was from a couple of months ago, but the info still might be useful to someone.

Yes, I have experience, although I'm not sure it will reassure you.

My son went from 25th to 97th percentile (birth to 13 months).

An ultrasound through his fontanelle showed he had hydrocephaly, and the MRI showed he had an arteriovenous malformation. Like Vale of Galen, but more rare.

He had to have embolisation surgery and then was on blood thinners for a year.

Luckily we lived 20 minutes from the only hospital in Scotland that had a surgeon that was experienced in this procedure (he'd actually invented it). My son was in hospital for almost a month, but the one procedure fixed everything and there were no lasting effects.

He's now 13 and you would never have known that he had an issue at all.

That must of been very scary for all of yous. So happy to hear all is well now. I am worried sick but hoping for the best. Thanks for your response x