Process sexual development maturity

Get involved in our campaigns and help ensure young people's health and rights. Also avilable in [ PDF ] format. Human development is a lifelong process of physical, behavioral, cognitive, and emotional growth and change. In the early stages of life— from babyhood to childhood, childhood to adolescence, and adolescence to adulthood—enormous changes take place. Throughout the process, each person develops attitudes and values that guide choices, relationships, and understanding. Sexuality is also a lifelong process.

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Sexual differentiation

Precocious puberty - Symptoms and causes - Mayo Clinic

Puberty is the process of physical changes through which a child 's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads : the ovaries in a girl, the testes in a boy. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones , muscle , blood , skin , hair , breasts , and sex organs. Physical growth —height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed. Until the maturation of their reproductive capabilities, the pre-pubertal physical differences between boys and girls are the external sex organs. On average, girls begin puberty around ages 10—11 and end puberty around 15—17; boys begin around ages 11—12 and end around 16— Notable among the morphologic changes in size, shape, composition, and functioning of the pubertal body, is the development of secondary sex characteristics , the "filling in" of the child's body; from girl to woman, from boy to man.
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The development of the reproductive systems begins soon after fertilization of the egg, with primordial gonads beginning to develop approximately one month after conception. Reproductive development continues in utero, but there is little change in the reproductive system between infancy and puberty. To become a male, an individual must be exposed to the cascade of factors initiated by a single gene on the male Y chromosome. Because females do not have a Y chromosome, they do not have the SRY gene. Without a functional SRY gene, an individual will be female.
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On a night just like any other, a girl innocently sleeps. But this night will change her life forever. In the very centre of her brain, a structure the size of a grape lights up. It sends out a pulse of hormone.
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