This video might be the best way to see infant development this side of becoming a parent. Our cast of infants demonstrate basic motor skills from rolling over to standing alone. They learn that objects can exist outside of their own experience, learn cause and effect, and slowly discover they are independent beings. Watch as they explore eye-hand coordination, feeding skills, a first smile, language understanding, baby talk, and the magical dance of senses and muscles called "sensorimotor" development.