The BMI for children also depends heavily on age and gender. the WHO has for children aged five to 18 years Guideline values have been set for the BMI: The BMI for girls between the ages of five and 18 is 13.9 to 25. Here, too, the BMI increases with age: while five-year-old girls have a BMI of 13.9 to 17.0, for girls aged 11 it ranges from 15.3 to 20.7 and for girls aged 17 it is 18.4 to 24.8. Boys, on the other hand, have a slightly higher BMI, ranging from 14.1 to 25.4 between the ages of five and 18. For example, the BMI for boys who are seven years old is 14.2 and 17.4 and for boys who are twelve years old it is 15.8 to 20.8. For 16-year-olds, the BMI should be between 18.2 and 24.2.
