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Body mass index (BMI) at age 4 to 6 years among children with weight for length at or below the 85th percentile (left) and above the 85th percentile (right) at 18 months: Overweight is defined as 18-month weight for length or 4- to 6-year BMI above the 85th percentile for age and sex; obese is defined as 18-month weight for length or 4- to 6-year BMI above the 97th percentile for age and sex; and as a result of rounding, percentages do not equal 100%.
