Weight-for-height in adolescence was investigated on the basis of observations on 669 boys and 753 girls. It was found: (a) that given the age, the expected weight of individuals of the same height changes considerably with pubertal status; (b) that the change in weight for a given change in height also depends on pubertal status, and (c) that these relations vary with age so that chronological age should be taken into account when constructing weight-for-height standards. Interpretation of weight-for-height standards is briefly discussed.