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Stricter definitions of "precocity" may refer only to central puberty starting before a statistically specified age based on percentile in the population (e.g., 2.5 standard deviations below the population mean), [4] on expert recommendations of ages at which there is more than a negligible chance of discovering an abnormal cause, or based on ...
The definition of the onset of puberty may depend on perspective (e.g., hormonal versus physical) and purpose (establishing population normal standards, clinical care of early or late pubescent individuals, etc.). A common definition for the onset of puberty is physical changes to a person's body. [13]
It commonly ends with the beginning of puberty. [2] Preadolescence is commonly defined as ages 9–12 [3] ending with the major onset of puberty. It may also be defined as simply the 2-year period before the major onset of puberty. [4] Preadolescence can bring its own challenges and anxieties.
When doctors talk about precocious puberty, they mean any signs of sexual maturity happening earlier than age 8 in a girl and age 9 in a boy. ... “We know that breast development is now starting ...
Precocious puberty on the rise. In the mid-19th century, girls had their first periods — which typically come about two years after they begin to show signs of breasts or pubic hair — at age ...
There has been a trend for years of children reaching puberty at earlier ages, and the reason why has largely mystified doctors. Now, new research is suggesting a possible culprit—and it shows ...
Development before birth, or prenatal development (from Latin natalis 'relating to birth') is the process in which a zygote, and later an embryo, and then a fetus develops during gestation. Prenatal development starts with fertilization and the formation of the zygote , the first stage in embryonic development which continues in fetal ...
Puberty typically begins during preadolescence, particularly in females. [ 4 ] [ 5 ] Physical growth (particularly in males) and cognitive development can extend past the teens. Age provides only a rough marker of adolescence, and scholars have not agreed upon a precise definition.