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There is early development of secondary sex characters and gametogenesis also starts earlier. Precocious puberty is of two types: true precocious puberty and pseudoprecocious puberty. In a minority of children with precocious puberty, the early development is triggered by a disease such as a tumor or injury of the brain. [1]
Early-maturing males develop "more aggressive, law-breaking, and alcohol abusing" behaviors, which result in anger towards parents and trouble in school and with the police. Early puberty also correlates with increased sexual activity and a higher instance of teenage pregnancy, both of which can lead to depression and other psychosocial issues.
The following year, Paul Mussen and Mary Cover Jones (1958) replicated the study using late and early maturing adolescent girls. [14] The researchers had different hypotheses for the girls than the boys. The advantageous socio-psychological environments that boys were exposed to for maturing earlier were different for early maturing girls.
Breast development will also be completed by this stage. In boys, four stages in development can be correlated with the curve of general body growth at adolescence. The initial sign of sexual maturation in boys usually is the "fat spurt". The maturing boy gains weight and becomes almost chubby, with a somewhat feminine fat distribution.
[5] [3] [6] Sometimes the terms tweenie and tweenager are used to differentiate between older (10 to 15) and younger (7 to 11) age groups, respectively. [7] [8] While known as preadolescent in psychology, the terms preteen or tween are common in everyday use. A preteen or preteenager [1] is a person below 13 years of age. [9]
Puberty is considered delayed when the child has not begun puberty when two standard deviations or about 95% of children from similar backgrounds have. [7] [8] [9]In North American girls, puberty is considered delayed when breast development has not begun by age 13, when they have not started menstruating by age 15, [2] and when there is no increased growth rate. [8]
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By age 1, children are able to say 1–2 words, respond to their name, imitate familiar sounds and follow simple instructions. [131] Between 1–2 years old, the child uses 5–20 words, says 2-word sentences, expresses their wishes by saying words like "more" or "up", and understands the word "no". [131]