The onset of female puberty is most often noticed through the physical changes of the female body. This period of development usually occurs between the ages of 9 and 11. Bone growth, increases in body fat, breast development, and pubic hair/underarm hair growth are the prominent indicators of puberty’s onset. Increases in body fat can be directly related to the onset of menarche, the first menstrual period. It is an important factor for adolescent girls to remember that there are wide variations in the onset and progression of puberty. The onset of male puberty is most noticeable by the physical changes of the male body. The hormone testosterone plays a key role in the development of external ge

Santrock, John W. “Adolescence, 9th edition.” 2003. McGraw-Hill Publishing, New York, NY.

nitals, increases in height, and voice changes. Three of the most noticeable changes in boys are penis size, body hair growth, and voice change.

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