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Physical development By this age, infants may have doubled their birth weights. They typically grow about 0.8 inches (2.0 cm) and gain about 1 to 1.5 pounds (450 to 680 g) during this month. [ 28 ]
Girls attain reproductive maturity about four years after the first physical changes of puberty appear. [3] In contrast, boys develop more slowly but continue to grow for about six years after the first visible pubertal changes. [27] [35] Approximate outline of development periods in childhood and early adulthood development. Adolescence is ...
Milestones are changes in specific physical and mental abilities (such as walking and understanding language) that mark the end of one developmental period and the beginning of another; [79] for stage theories, milestones indicate a stage transition. These milestones, and the chronological age at which they typically occur, have been ...
The CDC divides these milestones into several categories for each age, including social and emotional behaviors, language and communication skills, cognitive abilities and physical development and ...
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 ...
Jean Piaget's cognitive developmental theory describes four major stages from birth through puberty, the last of which starts at 12 years and has no terminating age: [11] Sensorimotor: (birth to 2 years), Preoperations: (2 to 7 years), Concrete operations: (7 to 11 years), and Formal Operations: (from 12 years). Each stage has at least two ...
Derived from the Latin puberatum (age of maturity), the word puberty describes the physical changes to sexual maturation, not the psychosocial and cultural maturation denoted by the term adolescent development in Western culture, wherein adolescence is the period of mental transition from childhood to adulthood, which overlaps much of the body ...
The Tanner scale (also known as the Tanner stages or sexual maturity rating (SMR)) is a scale of physical development as pre-pubescent children transition into adolescence, and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics , such as the size of the breasts ...