ADHD is a behavior disorder marked by inattention, impulsivity, and, in some cases, hyperactivity.

Children who have ADHD are often given medication as part of their treatment plan. The type of medication most often chosen is a psychostimulant.

A child with autism appears to live in his or her own world, showing little interest in others and a lack of social awareness.

Children with PDD have difficulty with language, communication, socialization, and motor behaviors. Autism is an example of a PDD.

Autism spectrum disorders, which include autistic disorder, affect children in different ways. Some children have mild symptoms, others have severe limitations.

Where can you as a parent turn to for the facts about vaccine safety? The first place to go is your child's doctor.