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The brain reaches 90% of its adult size by six years of age. [52] Thus, the brain does not grow in size much during adolescence. Over the course of adolescence, the amount of white matter in the brain increases linearly, while the amount of grey matter in the brain follows an inverted-U pattern. [53]
The speed of physical growth is rapid in the months after birth, then slows, so birth weight is doubled in the first four months, tripled by 1 year, but not quadrupled until 2 years. [85] Growth then proceeds at a slow rate until a period of rapid growth occurs shortly before puberty (between about 9 and 15 years of age). [ 86 ]
Childhood is the age span ranging from birth to adolescence. [7] In developmental psychology, childhood is divided up into the developmental stages of toddlerhood (learning to walk), early childhood (play age), middle childhood (school age), and adolescence (puberty through post-puberty). Various childhood factors could affect a person's ...
Newborns typically lose 7–10% of their birth weight in the first few days, but they usually regain it within two weeks. [ 17 ] During the first month, infants grow about 1 to 1.5 inches (2.5 to 3.8 cm) and gain weight at a rate of about 1 ounce (28 g) per day.
In some cultures, it is more helpful for this period of life between 18 and 25 years of age to be described as emerging adulthood instead of being the "tail-end of a so called extended adolescence, or as the early part of a so-called young adulthood that stretches from 18 years to 40 or 45 years of age". [13] [14]
Early Adolescence: 9 to 13 years; Mid Adolescence: 13 to 15 years and; Late Adolescence: 15 to 18 years; The adolescent unconsciously explores questions such as "Who am I? Who do I want to be?" Like toddlers, adolescents must explore, test limits, become autonomous, and commit to an identity, or sense of self.
Studies on the effect of emergencies and conflict on the physical and mental health of children between birth and 8 years old show that where the disaster is natural, the rate of PTSD occurs in anywhere from 3 to 87 percent of affected children. [80] However, rates of PTSD for children living in chronic conflict conditions varies from 15 to 50 ...
Adult development is a somewhat new area of study in the field of psychology. Previously it was assumed that development would cease at the end of adolescence. Further research has concluded that development continues well after adolescence and into late adulthood.