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ability activities adolescents adults American asked baby baby's become behavior birth body boys brain caregivers cells cervix changes Chapter characteristics chil child development child-rearing childbirth Children's Defense Fund chromosomes cognitive development common complex concept cultural dren early childhood ecological systems theory effective emotional environment environmental example experiences factors feel fetus gender genes genetic girls growth heredity hormones important increase infants influences intelligence interaction language learning mature meiosis menarche ment mental middle childhood months mother motor development newborn objects organized ovum parents peers percent period perspective physical Piaget placenta play pregnancy prenatal prenatal development preschoolers problems programs psychological relationships response result role scores sexual siblings social social learning theory stage stimulation superego tasks teachers teenagers teratogens theory thinking tion toddlers understanding uterus women X chromosome Yolanda young children youngsters zygote