The three types of CP are:

1. spastic cerebral palsy — causes stiffness and movement difficulties
2. athetoid cerebral palsy — leads to involuntary and uncontrolled movements
3. ataxic cerebral palsy — causes a disturbed sense of balance and depth perception.

Cerebral palsy affects muscle control and coordination, so even simple movements — like standing still — are difficult. Other vital functions that also involve motor skills and muscles — such as breathing, bladder and bowel control, eating, and learning — are also affected when a child has CP. Cerebral palsy does not get worse over time.

Premature babies — particularly those who weigh less than 3.3 pounds (1,510 grams) — have a higher risk of CP than babies that are carried full-term, as are other low birth weight babies and multiple births, such as twins and triplets.

Brain damage in infancy or early childhood can also lead to CP. A baby or toddler might suffer this damage because of lead poisoning, bacterial meningitis, malnutrition, being shaken as an infant (shaken baby syndrome), or being in a car accident while not properly restrained.

Children with CP have varying degrees of physical disability. Some have only mild impairment, while others are severely affected.

Associated medical problems may include visual impairment or blindness, hearing loss, food aspiration (the sucking of food or fluid into the lungs), gastro esophageal reflux (spitting up), speech problems, drooling, tooth decay, sleep disorders, osteoporosis (weak, brittle bones), and behavior problems. Seizures, speech and communication problems, and mental retardation are also common among kids with CP. Many have problems that may require ongoing therapy and devices such as braces or wheelchairs.