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
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Accumulating evidence demonstrates that the effects of leptin to regulate the onset of puberty are thought to be mediated mainly by its receptor LEPR action on hypothalamic neurons (Bellefontaine et al.
To determine the relationship between nutritional status and age at onset of puberty, this age range was further categorised as shown in Table 3, which indicates the influence of nutritional status on the age of pubertal onset.
56 onset of puberty (kg) Items HDG p value Age of puberty 196.
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Soon after, Biro and colleagues gathered data on a cross section of American girls for a research project into possible environmental contributors to the onset of puberty.
Several recent studies suggest that the timing of the onset of puberty in girls has become earlier over the past 30 years, and there is strong evidence that the increasing rate of obesity in children over the same period is a significant contributing factor.
Buying your first bra represents the onset of puberty and is a wonderful opportunity to bond with your daughter.
Each section gives a thorough overview of all of the changes that will happen to a tween during the onset of puberty.
a contextual amplification hypothesis holds that the early onset of puberty increases risk in adverse psychosocial contexts; a qualitative pathways approach that leads to help-seeking behaviors that are criminalized (e.
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Researchers at the National Institutes of Health and other institutions have found that exposure to lead in childhood may delay the onset of puberty in young girls, with higher doses increasing the chance for later maturation.