Growth and Development at Adolescence
From birth onwards the growth rate of most body tissues falls steadily, the fall being swift in the first two or three years and slower from about 3 onwards. The rate of growth in height decreases slowly from an average of 6.5 cm/yr at age 5.0 to about 5.0 cm/yr just before the adolescent spurt begins. Weight velocity is almost constant from age 3 to puberty, (rising from an average of 2.0 kg/yr to about 2.7 kg/yr) since the increase in fat velocity balances the drop in velocity of muscular and skeletal dimensions. Body shape continues to change, since the rate of growth of some parts, such as the legs and arms, is greater than the rate of growth of others, such as the trunk. But the change is a steady one, a smoothly continuous development of the final pre- pubescent physique rather than any passage through a series of separate stages.
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