onset of puberty


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onset of puberty

Boys: Between the ages of 13 and 15, a relatively rapid increase in height and weight occurs, with broadening of the shoulders and increase in size of the penis and testicles. Pubic and facial hair begin to grow. Endocrine and sebaceous gland activity is increased. Nocturnal emissions usually occur.

Girls: Between the ages of 9 and 16, a marked increase in growth is accompanied by breast enlargement and appearance of pubic hair. Within 1 to 2 years after these changes, underarm hair grows and the normal whitish vaginal secretion (physiological leukorrhea) characteristic of the adult female is noticed. Several months later the first menstrual period (menarche) occurs. Each individual will vary somewhat from this schedule.

Patient care

Before puberty, young girls should be told about menstruation and the techniques of menstrual protection through use of perineal pads or tampons. In addition, they should be told that a certain amount of intermenstrual vaginal discharge (leukorrhea) is normal but if the secretion is malodorous or causes irritation of the vulva, a health care provider should be consulted. See: menstruation

At puberty, boys should be assured that the size of the penis is not related to the degree of masculinity and is not an important factor in experiencing or providing sexual gratification.

See also: puberty
References in periodicals archive ?
In female mice, expression of LIN28B decreases in the ovary prior to the onset of puberty, and neither let-7a nor let-7g levels significantly changed [13].
Excessive nutrition and obesity are thought to trigger the onset of puberty. Nutritional status during childhood is thought to be 25% responsible for the early onset of puberty (30).
Pubertal height gain and AH were analysed in children who started GH around the onset of puberty and compared with the outcomes in short SGA children who initiated GH therapy at least one year before the onset of puberty.
In fact, the onset of puberty is a complex phenomenon, which is known to be controlled by genetic, environmental and endogenous factors (Burns et al., 2010).
The age at onset of puberty was categorised as precocious (<8 years), normal (8-13 years) or delayed (>13 years).
investigated the association between age at onset of puberty and age at onset of schizophrenia and found a significant negative correlation between the three measurements (first strange behavior, first psychotic symptoms and first hospitalization for psychiatric reasons), which is consistent with the findings in our study (27) However, a study carried out by Ruiz et al.
The association between childhood overweight and early onset of puberty has been evaluated in several studies, because excess adiposity and body fat are hypothesized to be causal factors of early pubertal development [1-3].
Researchers first noticed the earlier onset of puberty in the late 1990s, and recent studies confirm the mysterious public health trend.
There are presently around 27,000 research reports on this subject that highlight their connection with cancers, early onset of puberty, declining fertility and so on.
"If you basically say that the onset of puberty has a bell-shaped distribution, it seems to many of us the whole curve is shifting to the left," says Paul Kaplowitz, chief of the division of endocrinology and diabetes at Children's National Medical Center in Washington, D.C.
During childhood, migraine prevalence is similar among boys and girls, but with onset of puberty, the prevalence of migraine increases significantly in women 5-20 per cent and 2-10 per cent in men.
Other factors such as ethnicity, nutritional conditions, and secular trends have been proven to influence the physiological range in age at the onset of puberty.5 Changes at the time of puberty have implications for the treatment of individual children for diseases later in life, and for chemical testing and risk evaluation for the overall population.