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Puberty is defined as the period of human development during which physical growth and sexual maturation occur and a child's body becomes an adult's body, capable of reproduction. Strictly speaking, the term puberty (derived from the Latin word puberatum, meaning “age of maturity”) refers to the bodily changes of sexual maturation, whereas adolescence, by contrast, is the term that refers to the psychosocial transition between childhood and adulthood. That said, the boundaries of puberty and adolescence overlap, thus, this entry will discuss both the physical and psychosocial characteristics of this particular stage of female development.

Puberty is an experience that unites women worldwide, from all cultures and social status. Puberty in a girl tends to begin two years earlier than it does in a boy and can start as early as 8 years old or even as late as 15, although the more common age is around 10 or 11. This means that a girl can find herself going through puberty when her best friend of the same age is not, and this can be an isolating and turbulent experience. Puberty is not something that happens overnight but rather is a process that occurs in different stages. Puberty is initiated by hormonal changes triggered by a part of the brain called the hypothalamus, which stimulates the pituitary gland, which in turn activates other glands from which comes a flood of reproductive hormones. These changes begin about a year before any of their results are visible. Both the male reproductive hormone testosterone and female hormone estrogen are present in children of both sexes. However, their balance changes at puberty, with girls producing relatively more estrogen and boys producing more testosterone.

The experience of puberty unites women worldwide, as the shame, uneasiness, embarrassment, and displeasure that a young girl feels at some point during the physical changes of puberty are almost universal.

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Five Phases of Puberty

The Tanner Scale, established by British pediatrician James Tanner, identifies five distinct physical stages in female sexual development. During the first stage, the prepubertal stage, which occurs generally between the ages of 8 and 11, there are no major outward signs of sexual development. However, a girl's ovaries are enlarging, and hormone production is beginning.

The second stage of female sexual development is said to occur around the age of 11 or 12, although the full age range for this stage is 8 to 14, and involves accelerated height increase, weight gain, breast growth (palpable breast buds and areolae enlargement), and the emergence of minimal coarse, pigmented hair, mainly on the labia. Stage three usually takes place at the age of 12 or 13 (full age range: 9 to 15) and brings about peak height increase, elevation of the breast contours, further enlargement of the areolae, further growth of pubic hair (coarser and darker), production of vaginal discharge, and perhaps the onset of menstruation toward the end of this stage. Other changes that can occur during stage three concern the skin, with the possible outbreak of acne vulgaris due to increased secretion of sebum and perspiration body odor, as a result of hormonal changes.

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