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child development, the progressive maturation of perceptual, emotional, intellectual, and behavioral functions from the early stages of language acquisition, typically around one or two years of age, to the onset of adolescence, at about 12 or 13 years. A brief treatment of child development follows. For full treatment, see human behavior: Theories of development. The physical growth of children is treated in human development. The end of infancy and the onset of childhood are marked...