Cerebral palsy is a description for several chronic disorders that impair movement control, appearing in the first few years of life, causing spastic and stiff muscles in their legs and (to a lesser degree) in their arms. Children will have difficulty grasping objects, crawling, and walking. They will not get better when they grow up, but it will not get any worse also.
According to The United Cerebral Palsy Association, it is estimated that more than 500,000 Americans have cerebral palsy. This type of disease is diagnosed by testing the motor skills of the infant and carefully looking at his or her medical history.