Childhood is the age span ranging from birth to adolescence. According to Piaget's theory of cognitive development, childhood consists of two stages: preoperational stage and concrete operational stage. In developmental psychology, childhood is divided up into the developmental stages of infancy and toddlerhood (learning to walk and talk, ages birth to 4), early childhood (play age covering the kindergarten and early grade school years up to grade 4 (5-10 years old)), preadolescence, around 11 and 12 (where puberty could possibly begin in early developers but could equally be in early childhood if the child has not reached puberty), and adolescence (puberty (early adolescence, 13-15) through post-puberty (late adolescence, 16-19) ). Various childhood factors could affect a person's attitude formation.'''
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