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The time is past when infants were permitted, like Topsy, merely to grow. Nowadays everything they do is ordered for them. Thus Dr. Wilkes presents in a small book a series of exercises for the infant under 1 year of age, which are planned with a view to developing his muscles along proper lines. The exercises are illustrated and the entire process may afford the mother an amusing period of play with the child and at the same time react to the infant's benefit.
Baby's Daily Exercises. A Manual of Exercises for Infants from Five Months to One Year of Age.. JAMA. 1928;90(16):1319. doi:10.1001/jama.1928.02690430057036