B. G. Jefferis and J. L. Nichols, Searchlights on Health — How to Preserve the Health and Life of Your Infant During Hot Weather (1919)
“ Children should have exercise in the house as well as outdoors, but should not be jolted and jumped and jarred in rough play, not rudely rocked in the cradle, nor carelessly trundled over bumps in their carriages. ”
