Puberty in Boys
Puberty is the period of growth and development in which children and adolescents of both sexes begin to develop adult physical features, such as breasts or facial hair, and become able to reproduce (create babies). For boys, puberty usually happens between ages 10 and 14, though it can happen earlier or later.
The entire reproductive system, including puberty, is controlled by hormones. Hormones are chemical messengers made in certain parts of your body that travel through the blood to signal other parts of the body what to do.
Puberty in boys starts when hormones released by the brain cause the testicles to develop. The testicles then release the hormone testosterone. Testosterone is a male sex hormone that causes people to develop facial hair, a deeper voice, and other male physical features. Hormones also cause the testicles to make sperm.
The following physical change take place, usually in this order:
First, the scrotum (skin around the testicles) and testicles get larger
Soon after, the penis grows longer—this usually happens between ages 11½ and 13
The seminal vesicles and prostate, which are involved in making semen, grow larger
Pubic hair grows
A growth spurt happens, and a boy develops bigger muscles and broader shoulders
Hair grows on the face and under the arms
Ejaculation (the release of sperm from the penis) usually becomes possible around age 12 ½ to 14 years
Fertility (ability to father children) happens as an older teen
Some boys’ breasts grow (gynecomastia) during early puberty, but this usually goes away within a year.
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