What is the definition or description of: obesity in children?

As per the CDC: Body mass index (bmi), expressed as weight in kilograms divided by height in meters squared (kg/m2), is commonly used to classify obesity among adults, and is also recommended for children. Bmi-for-age-growth charts for the United States are used to plot percentile. Children with bmi values at or above the 95th percentile are considered obese by this definition. Talk to your pediatrician for more.

BMI: Body mass index (bmi) is a measure used to determine childhood overweight and obesity. It is calculated using a child's weight and height. Bmi does not measure body fat directly, but it is a reasonable indicator of body fatness for most children and teens. A child's weight status is determined using an age- and sex-specific percentile for bmi.