Is Your Child Overweight?

A child with a body mass index at or above the 95th percentile for age and sex is considered overweight. BMI uses height and weight measurements to estimate how much body fat a person has. To calculate your child's BMI, divide his or her weight by his or her height squared, or wt/ht2. (Important: To use this formula for BMI, the child's weight and height measurements must be in kilograms and meters, respectively. If you use pounds and inches, multiply the result by the conversion factor 703.)

An easier way to get your child's BMI is to use a BMI calculator Once you know your child's BMI, it can be plotted on a standard BMI chart. Your child will fall into one of 4 categories:

• Underweight: BMI below the 5th percentile

• Normal weight: BMI falls between the 5th and the 85th percentiles

• At risk for overweight: BMI between the 85th and 95th percentiles
  

• Overweight: BMI at or above 95th percentile

BMI is not a perfect measure of body fat and there are situations where BMI may be misleading. For example, a very muscular person may have a high BMI without being overweight (because extra muscle adds to a person's body weight - but not fatness). In addition, BMI may be difficult to interpret during puberty when kids are experiencing periods of rapid growth. It's important to remember that BMI is usually a good indicator - but is not a direct measurement - of body fat.

These days, you may be hearing more about BMI. Doctors are using BMI during routine check-ups and many school districts are including BMI in their annual health assessments.

If you're worried that your child or teen may be overweight, make an appointment with your child's doctor. If your child is overweight, your doctor may ask about your child's eating and activity habits and make suggestions on how to make positive changes. He or she may also decide to screen for some of the medical conditions that can be associated with obesity (see below). Depending on the child's BMI, age, and health, the doctor may refer you to a registered dietitian for additional advice. For some overweight children, your doctor may recommend a comprehensive weight management program.