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rapid increase in height and
weight that occurs during
adolescence.
The growth spurt for girls typically
occurs around age 10.5.
The growth spurt for boys
typically occurs around age 12.5.
Sexual Development of
Females
The first sign of puberty is the
growth spurt.
The breasts begin to develop and
pubic hair begins to appear.
Menarche (the first menstrual
period) occurs a year after the
development of the breasts
(between 12.5 and 13 years old).
Sexual Development of
Males
The initial sign of puberty is the
growth of the testes (around 11.5
years old).
During the growth spurt (around
age 12.5) enlargement of the penis
occurs.
Development of pubic hair.
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