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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?

No Worry: The "percentile" for head circumference is a reflection of your child's head circumference comparred to others, and it is best if the "percentile" does not change greatly. 50% at 1 mo and 2 mo means your child's rate of head growth is perfectly fine. Concern only when head circumference increases/decreases by more than 2 standard deviations. Example: 50% at 1 mo, then 95% at 6 mos. ...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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My baby had a 36cm hc at 9 days and now he's 2 month and a week old and his head is 41cm ... he is on 80-90 percentile weight n length.is it concernin?

Ask about percentile: This sounds like a great percentile for a 2 month old. Early HC are often unreliable due to moulding of the skull. Continue to follow his measurements on his growth curve. Developmentally he should be smiling, recognizing your face and following. All the best. ...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

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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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What does it mean if my daughter is in the 10th percentile for head circumference?

Population norms: Growth features including head circumferancee, length and weight have been collected over the years and publishes as basic guidelines for following growth in kids.The average of all would be at 50% while some would be on the larger or smaller size. The 10% means only that of 100 kids born on the same day, her head is larger than 10% but smaller than 90%. ...Read more

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What does it mean if a baby's head circumference percentile drops from 90 to 75 at 5.5 months? Does it indicate intelligence levels?

What does it mean if a baby's head circumference percentile drops from 90 to 75 at 5.5 months? Does it indicate intelligence levels?

Head size: My first thought is technique and is a measuring error. That's the most likely. I would get it measured again and monitor it over the next few weeks to see if it is real or to watch the trend. Premature closure of the soft spot is a possibility which is fixable. Lower IQ would be unlikely. Talk to your doctor and let him know your concern and work together. ...Read more

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My 18mo son is always on the lower end of percentiles, except head circumference. Is this an indication of his future height and weight?

My 18mo son is always on the lower end of percentiles, except head circumference. Is this an indication of his future height and weight?

Hard to say: The best predictor of how a male is growing and where they will end up is their parents. Final height is expected to be the average height of the parents plus 2.5 inches. Body frame and muscularity also tracks as a blend of both parents, with more features contributed by the parent of the same sex.Since I do not have any details, the answer must remain very general. ...Read more

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8mth old is 2ft and 7 inches that shouldn't be in the 1 percentile should it? I know his weight is low only 15.8 and head circum 45 but he seems tall

8mth old is 2ft and 7 inches that shouldn't be in the 1 percentile should it? I know his weight is low only 15.8 and head circum 45 but he seems tall

Height: Yes, 2 ft 7 inches is much greater than the 1% - (sorry, i thought the previous post read 2 ft 1/2 inch). His height is greater than the 99%, wt is 1% and his head is 56%. I still would like to know what his birth statistics were for comparison - gives a better picture of what might be going on. ...Read more

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Could my child have craniosynostosis if her head shape is normal but in the 10th percentile for circumference and a tiny soft spot?

Could my child have craniosynostosis if her head shape is normal but in the 10th percentile  for circumference and a tiny soft spot?

Craniosynostosis: If the head shape is normal then it is unlikely craniosynostosis - if the development is normal then the small soft spot is likely not an issue. ...Read more

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Our grandchildren's pediatricians always say what "percentile" they are in weight, length, head circumference. How important is this info?

Our grandchildren's pediatricians always say what "percentile" they are in weight, length, head circumference. How important is this info?

Screening test: Most adults get used to screening lab to "check out the system" as part of a visit.For kids, we have growth and physical development that provides us with the same kind of information.I can anticipate where on a growth chart a kid should be from the size of their parents. Then, as long as the kid stays within expected percentiles for growth and development, I have good evidence for good health. ...Read more

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Small head circumference and low weight percentile mean failure to thrive?

Small head circumference and low weight percentile mean failure to thrive?

Depends: By definition, at least 3% of the normal population will grow along the smallest portion of the regular growth scales. Consistent growth along that or any percentile is not necessarily a failure to thrive. However;infants starting at the 25% & moving down to the 10% months later & heading toward the 5% in such measurements would be considered ftt because if the drop in growth rate. ...Read more