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Doctor insights on: Head Percentile Calculator

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What does it mean when my nine month old's head is in the 97th percentile?

What does it mean when my nine month old's head is in the 97th percentile?

He has a big head: At least 3% of the normal population will have a head of this size or more, and usually one or other parent does too. There are some medical conditions where this is worrisome, but the doc will look into that. For most, it is just hard to find a hat that fits. It doesn't bother me at all. ...Read more

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My 4 month olds head circumference went from 70th percentile to 89th percentile in one month. Should I be worried?

My 4 month olds head circumference went from 70th percentile to 89th percentile in one month. Should I be worried?

Not necessarily: Variations in head circumference from month to month can be due to rapid rate of growth early in life or to measurement variance. If the baby appears not to be meeting age-appropriate milestones; loses tone, is intolerant of feeding, has fever or a bulging fontanelle, please have her or him evaluated immediately. ...Read more

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Should i be worry if the head circumference percentile always stay flat? For example, 50% at 1 month and 50% at two months?

Should i be worry if the head circumference percentile always stay flat? For example, 50% at 1 month and 50% at two months?

Average growth: That the kid stays at 50% is not bad, it means his head growth is following the same rate of growth that the average kid does.A drop off or jump up in the percentage could mean problems. ...Read more

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My 9 month old son's weight and height is in the 18th percentile but his head is in the 67th. Should i be concerned that his head is so much larger?

My 9 month old son's weight and height is in the 18th percentile but his head is in the 67th. Should i be concerned that his head is so much larger?

Yes & no: The most common reason for a big head size is it is inherited as a dominant trait from a parent. If your kids developmental progress is normal & the head has always been on the large side i'd just watch it. If the head is growing faster than the body & increased from lower to higher percentiles i'd have a study done. ...Read more

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My daughters head is measuring below the 10th percentile. Is that healthy?

Depends: Head size is determined by genetics as well as other factors. If it has always been below the 10th percentile, is growing parallel to that line, she is developing normally and there are no other concerns then it may be genetic. If it started out higher and has been getting progressively lower on the percentile chart then she needs an evaluation. ...Read more

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What do you suggest if my childs head is measuring below the 10th percentile?

See Doctor Now: Your child's age is unknown. Head circumference is an indicator of normal brain growth in infants and is monitored from birth to 24 mos. A circumference < 10% must be evaluated with height & weight in order to determine overall small stature vs. an isolated anomaly of head growth. Developmental milestones must also be assessed. See your child's doctor now. Early intervention is very important. ...Read more

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What does it mean if the circumference of my baby's head is above a certain percentile?

See below: As long as your baby's head stays at that percentage there is not problem. Some children have large heads, and some small. If the head circumference keep increasing then there may be a problem. The pediatrician is well aware of this and will keep an eye on it for you. ...Read more

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At 9.5 son's head is 56.5cm, 3 standard deviations above the mean. Was 55.5cm at almost 9. Was in 90 and 89 percentile before this. Normal or concern?

At 9.5 son's head is 56.5cm, 3 standard deviations above the mean. Was 55.5cm at almost 9. Was in 90 and 89 percentile before this. Normal or concern?

Why at age 9 years: are you still measuring head circumference? It can grow very little and very slowly at this age not as it was during infancy, because the fontanelles were still open, if you're suspecting something wrong with your child 's head talk to your pediatrician first, he or she after examining your child might request an imaging study, a simple CT scan would suffice, but that would be the MD's judgement ...Read more

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Nine month old head size 97 percentile, is that bad?

Nine month old head size 97 percentile, is that bad?

Depends: If it has changed from the 10% to the 97% since birth, I would be more concerned than if it was big all along. If his height and weight are on the larger side it would be more consistent with a normal variant. It didn't bother me much in life, except when looking for a helmet that would fit. ...Read more