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Doctor insights on: Baby Large Head Circumference

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What is normal head circumference for a 9mnth old?

What is normal head circumference for a 9mnth old?

Depends on gender ;: Velocity of growth. Has the head circumference grown normally along a single curve between 5th-95th%ile or increased too rapidly, e.g., jumping from 25th to 95th %ile (as may be seen in autism or hydrocephalus), or too slowly, e.g., dropping from 25th to 5th%ile, (indicating insufficient brain growth)? Girls' range at 9 months is 41.6-46.6 cm; avg. Is 44 cm. Boys, 43-47.4 cm; avg. Is 45.4 cm. ...Read more

Dr. Ronald Krauser
14 doctors shared insights

Large Head (Definition)

Large heads in infancy need to be followed by pedi MD over time. By itself, can be due to parental large head. If it is out of range and no family history and other things are occurring, i.e. delayed speech and behaviors this can be a soft sign to autism spectrum disorders. If increasing head size over time, can also be due to CSF fluid leaks causing that ...Read more


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17 wk old niece head circumference is on 99th percentile.50th percentile for height and weight. Is this a problem? Her mother has quite a large head.

17 wk old niece head circumference is on 99th percentile.50th percentile for height and weight.  Is this a problem? Her mother has quite a large head.

Probably fine: It's fine for an infant to have a large head, as long as it stays at a fairly constant percentile. It's only when heads grow or shrink too quickly that the child should be evaluated further. Make sure to talk with ur baby's pediatrician if u r concerned. ...Read more

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Is there a correlation between abnormally large head circumference and an increased chance of neonatal seizures?

Increased pressure: Head circumferences that increase rapidly (can be followed on the head circumference growth chart) can be associated with neonatal seizures if increased intracranial pressure is present. ...Read more

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If a baby has a rather large head, would it be possible for their body grow for their head size?

If a baby has a rather large head, would it be possible for their body grow for their head size?

Yes.: Weight varies with height. But head size has nothing to do with height or weight. So although it is possible that someone's body could grow to match their large head, there is no guarantee it will happen. Further, the percentage of your body length that is your head is about 30% at birth, but only 10% as an adult, so babies tend to have bigger heads than adults. ...Read more

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What does 90% percentile in infant head circumference mean?

What does 90% percentile in infant head circumference mean?

Relative study: His rating means that 10% of infants at this age have a larger head circumference (size) while 90% are smaller.If the size has increased from 25-50-75-90% over several months it would suggest growth was too rapid. If usually in that range, it just means the kid has a big head. It hasn't bothered me any, except for having trouble finding a helmet/hat that would fit. ...Read more

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My child was diagnosed with macrocephaly. I took her in to get an MRI done It came back normal. Is her head going to be abnormally large when teenager?

NO: Large head size is usually inherited. Chances are she will have a larger head but no more so than her family members and certainly not apparent to those who are not carrying around tape measures. She will look fine. ...Read more

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What could be wrong if the doctor says the baby has a large head measurement at ultrasound?

Error in dates / Pbm: Having a large head is relative. If you are supposed to be "x" weeks along you are supposed to have a head of a certain size, if your head is bigger, you might be further along. You might also have a developing problem in your head, but that is where a more specific ultrasound or interpretation by a specialist needs to be considered. ...Read more

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Macrocephaly/how large is the head?

Macrocephaly/how large is the head?

Macrocephaly: Macrocephaly is diagnosed when the circumference of the head is more than two standard deviations above average for the child's age, sex, race, and period of gestation and may be caused by many conditions. Macrocephaly would be the diagnosis if the ofc (occipito-frontal circumference) is >90%ile for his age and gestation. ...Read more

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Large head measurement at ultrasound. Is that water head?

Large head measurement at ultrasound. Is that water head?

One possibility: It is possible. Sonography would show dilated ventricles if that were the case. ...Read more

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What causes an unusually large head?

What causes an unusually large head?

Genetics: There are by definition 3% of the normal adult population that are classified as having an over sized head & 3% that would be considered small. When I see it in a kid i usually find either mom or dad has one as well. There are syndromes & birth defect (hydrocephalus) that can also produce a large head, but by far the largest group just inherited the feature. ...Read more

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What could a large head measurement mean?

Depends on situation: For many, it means you have a genetically larger head size, as I do, making finding a hat that fits a bit difficult. For some infants, it can mean a build up of pressure within the skull caused by abnormal fluid flows within the brain, requiring a surgical procedure. ...Read more

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What is the definition or description of: Large head?

What is the definition or description of: Large head?

Macrocephaly: Large heads in infancy need to be followed by pedi MD over time. By itself, can be due to parental large head.
If it is out of range and no family history and other things are occurring, i.e. delayed speech and behaviors this can be a soft sign to autism spectrum disorders.
If increasing head size over time, can also be due to CSF fluid leaks causing that increase, hydrocephalus Neurologist need ...Read more

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I don't know what abnormally large head is but was embarassed to admit it. Can someone tell me?

I don't know what abnormally large head is but was embarassed to admit it. Can someone tell me?

Head size varies: There is a wide range of normal head size from ~18-24 inch circumferance in adult & by itself means nothing more than being very tall or short. One or both parents of an identified kid will often have a lg head size. In some kids increasing head size could represent an abnormal accumulation of fluid in the brain. ...Read more

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Can a Thin Person have a Large Head, or does he need a smaller equal size head to adapt to his Body?

Can a Thin Person have a Large Head, or does he need a smaller equal size head to adapt to his Body?

Large head: Our head size is more influenced by genetics than it is by our body size. Although as kids we go through a stage of having big heads, later on body and head will seem more proportional. ...Read more

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Why does dwarf have such a large head?

Why does dwarf have such a large head?

Achondroplasia: People with this condition give the impresion of having a large head because they usually have frontal bossing(prominent forehead) and a flat nasal root. Actually their head is normal but disproportionate to their body. ...Read more

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Had ob ultrasound. What could a large head measurement mean?

Had ob ultrasound. What could a large head measurement mean?

Depends: Depending on how many weeks you are would be needed to give a better explanation. More than likely it is normal with the baby having a large head. Speak with your OB and after they evaluale the complete us will be able to give you a more precise answer. ...Read more

Dr. Guillermo Philipps
25 doctors shared insights

Macrocephaly (Definition)

Children with macrocephaly have a head circumference (the measurement around the widest part of the head) that is greater ...Read more