Studies of the growth records of thousands of persons measured from birth to adult age provide a guide.
A boy who is well nourished and with an average history of illness will double his 2 year length at 18 years of age. A girl at maturity will be twice her length at 18 months, When a boy is 6-1/2 and a girl is 5, they have attained two thirds of their full height. Three quarters of adult height is reached by a boy at 9 and a girl at 7-1/2.
Poor nutrition is the most usual cause of retarded growth. For this reason, proper feeding beginning at infancy is extremely important.
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