ABSTRACT
When parents brag about their children’s accomplishments to friends and family or document important events with camcorders and baby books for posterity, they tend to focus on infants’ physical and motor development. Parents view physical growth and motor skills as important milestones, because getting bigger and stronger and rolling over, sitting up, and the like are dramatic, easily observable signs that children are developing normally. Psychologists, like parents, have a long tradition of using physical and motor development as a yardstick for verifying that infants are developing on schedule.
