Source of these ranges?

World Health Organization (WHO) classification for adults.

Do they apply to children?

No — children use age- and sex-specific percentile charts.

WHO has additional cut-offs for some Asian populations.

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Look up the WHO BMI category from a value.

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Underweight

< 18.5

Normal

18.5 – 24.9

Overweight

25 – 29.9

Obese (Class I)

30 – 34.9

Obese (Class II)

35 – 39.9

Obese (Class III)

≥ 40

BMI 22 falls in the "Normal" range per WHO.

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