Answer:
How Are Overweight and Obesity Defined?
Body mass index (BMI) uses height and weight measurements to estimate a person's body fat. But calculating BMI on your own can be complicated. An easier way is to use a BMI calculator.
After calculating BMI and plotting the result on standard BMI charts, doctors use four categories to describe weight in kids ages 2 to 19:
underweight: BMI below the 5th percentile
normal weight: BMI at the 5th and less than the 85th percentile
overweight: BMI at the 85th and below 95th percentiles
obese: BMI at or above 95th percentile
For kids younger than 2 years old, doctors use weight-for-length charts instead of BMI to determine how a baby's weight compares with their length. A child under 2 who falls at or above the 95th percentile is considered overweight.
BMI is not a perfect measure of body fat and can be misleading in some cases. For example, a muscular person may have a high BMI without being overweight (extra muscle adds to body weight — but not fatness). Also, BMI might be hard to interpret during puberty when kids have periods of fast growth. Remember, BMI is usually a good indicator of body fat, but it's not a direct measurement.
If you're worried about your child’s weight, take them to see the doctor. The doctor will ask about eating and activity habits and make suggestions on how to make healthy lifestyle changes. The doctor also may order blood tests to look for some of the medical problems linked to obesity.
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