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Immunizations & Health

Baby Weight Percentages

What Percentile Is Your Child In, and Does It Matter?

Baby Weight PercentagesYour friend recently bragged that her son was in the 90th percentile for weight. But at your son's recent checkup, the doctor said he was in the 10th percentile. Why are you feeling competitive all of a sudden, and does the difference really matter? Indeed, new parents often can't wait to have their baby weighed so they can see what percentile he or she is in. But what do baby weight percentages really mean? This is a weighty issue – no pun intended.

What Are Baby Weight Percentiles?
"Weight percentiles tell us the percentage of kids at the same age in the United States that weigh less or the same as we do," says Dr. Deborah Lonzer, Interim Chair, Department of Regional Pediatrics at Cleveland Clinic Children's Hospital in Cleveland, Ohio. "For example, if you are at the 50th percentile, then about 50 percent of kids are lighter than you, and you are at the median weight for kids that age. If you are at the 75th percentile, then you are as heavy or heavier than 75 percent of kids the same age. It is important to plot the weights on the growth charts at very accurate ages – 2 years is very different than 28 months of age."

It is most important, when evaluating growth, to look over time.

To know what percentile your baby is in, use our Baby Weight Percentile Calculator.

These numbers are based on data that has been collected on kids' growth in the United States through the National Center for Health Statistics since the 1960s. The first growth charts were developed for use in the late 1970s, and later revised in 2000, based on updated height and weight data that was collected. Nowadays, Body Mass Index (BMI) growth charts are also used. BMI is a way of monitoring growth and can help to predict future high cholesterol, heart disease and obesity – major health risks to today's society. The size of an infant's head is also monitored when looking at growth and development.


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Baby Weight Percentages

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Anonymous says
2 weeks, 1 day ago

MY 7 MONTH OLD BABY WEIGHS 21LBS SHE IS A VERY SMART STRONG GIRL! SHE HAS A CUSIN WHO JUST TURNED 1 YR OLD YESTERDAY AND SHE IS SO TINY COMPARED TO MY DAUGHTER. MY BABY IS ALMOST TALLER THAN HER AND ITS WEIRD BUT SOME KIDS ARE JUST BIGGER THAN OTHERS I SEE MY DAUGHTER HEALTHIER THAN HER COUSIN BUT I DONT KNOW MAYBE IM WRONG

Anonymous says
3 weeks, 2 days ago

My daughter is 20lbs at the 5month mark. She supplemented with formula every feeding. I know of babies her age that are 6 lbs less at her age. i'm wondering if i should be nervous about her being overweight in the future. DOES anyone have a suggestion?

Anonymous says
3 weeks, 2 days ago

when i compare my daughter to other people children who were born around the same time i find that my lil girl is so tiny. she is 13 pounds and i know of a lil boy who is 3months who is past her in weight but he doesnt look over weight at all. my daughter looks healthy however she is not as chubby as other kids

Anonymous says
November 23, 2009

Yes 13 lbs for a 5 month old is fine my 5 month old is 12.8. As long as they are thriving you have nothing to worry about.

Anonymous says
November 22, 2009

if you're asking questions in regards to your baby and if its normal or ok...common sense people ASK THEIR DOCTOR! they know BEST!

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