Plain Facts for Old and Young by John Harvey Kellogg

19. _Weak backs, pains in the limbs, and stiffness of the joints_, in

children, are familiar signs of the habit. To the first of these conditions is due the habitual stooping posture assumed by these children. The habit referred to is not the only cause of these conditions, but its causative occurrence is sufficiently frequent to give it no small importance as a suspicious indication.