Autism is a neurodevelopmental disorder. It is characterized by impaired social interaction, verbal and non-verbal communication, and restricted and repetitive behavior. Parents usually notice signs of autism in the first two years of their child’s life. These signs often develop gradually. In some cases, children with autism reach their developmental milestones at a normal pace and then lose speech and social skills. Usually, autism occurs before age three. While autism is highly heritable, researchers suspect both environmental and genetic factors as causes. In some rare cases, birth defects are responsible for autism. Autistic children mainly display many forms of repetitive or restricted behavior, and there some other symptoms like superior skills in perception and attention. Treating children with autism is mostly behavioral. Medication can be introduced when behavioral treatment fails.