It is difficult to generate BMI cut-offs for children because they are growing all the time and their body fat levels are constantly changing. For this reason, BMI is not used to assess whether children are a healthy weight in the same way it is for adults. Childhood BMI measurements are adjusted to take into account the child's age and their sex. Experts can generate BMI measurements for children over the age of two. However, these numbers are less accurate than for adults and people outside the medical field should not draw conclusions from them.

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