Many parents assume BMI shows how healthy their child is, but it is only a starting screening tool. It does not show where body fat is stored, and an active, muscular child may have a high BMI without excess fat. Another child with a normal BMI may carry extra fat around the belly, which can raise the risk of diabetes, high blood pressure and other metabolic problems later. Children are always growing, and puberty changes height, muscle and body fat, so doctors look at growth charts, how fast a child moves across percentiles, waist size, blood pressure, diet, activity, sleep, screen time and family history. Blood tests may be advised if needed. Parents should avoid shaming or pressuring a child about weight. Focus on healthy habits instead, such as nutritious meals, daily active play, enough sleep, fewer sugary drinks and less screen time. The goal is a healthy, happy child, not a particular BMI number.
