MEDICAL PHYSIOLOGY

Detailed explanation-1: -Ages 2 through 6 are the early childhood years, or preschool years. Like infants and toddlers, preschoolers grow quickly-both physically and cognitively. A short chubby toddler who can barely talk suddenly becomes a taller, leaner child who talks incessantly.

Detailed explanation-2: -Early Adolescence (Ages 10 to 13) They usually start a year or two earlier in girls than boys, and it can be normal for some changes to start as early as age 8 for females and age 9 for males.

Detailed explanation-3: -childhood, period of the human lifespan between infancy and adolescence, extending from ages 1–2 to 12–13. See child development. This article was most recently revised and updated by Amy Tikkanen.