Cerebral palsy (CP) is a group of permanent movement disorders that appear in early childhood. Often, symptoms include poor coordination, stiff muscles, weak muscles, and tremors. There may be problems with sensation, vision, hearing, swallowing, and speaking. Often babies with cerebral palsy do not roll over, sit, crawl, or walk as early as other children of their age. Difficulty with the ability to think or reason and seizures each occurs in about one third of people with CP.