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ability active adults allele attachment babies baby's become begin behavior birth capacity caregiver cells changes Chapter chil child Christine chromosomes circular reaction classical conditioning cognitive development concept context culture DeeDee developmental developmentalists dren early effects Egeland embryo emerge environment example experience eyes factors father feelings fetus Frank gender genes genetic girls grasp human important infants influence instance interaction involved Karen language later learning look major Malcolm mature meiosis memory ment Meryl metamemory middle childhood Mikey Momma months of age morphemes mother newborns object permanence objects occurs older parents patterns person Piaget placenta play prenatal development preschool period preschoolers problems reflex relationships researchers response role siblings skills smile social social learning theory sounds Sroufe stage stepping reflex stimulation stress sucking task temperament tend teratogens theory things tion toddler period understanding visual visual acuity words X chromosome