The purpose of this study is to find out how the brain learns to move in infants with and without brain injury. Some infants with brain injury later have cerebral palsy (CP), a condition that makes it hard for infants to learn how to move and control their balance, and others do not. Three groups of infants will participate- infants who had a brain injury and are at high risk for CP, infants who had a brain injury and are not at high risk for CP, and infants who are typically developing.