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is one of the mental, emotional, and behavior disorders that appears in early childhood. , or autistic disorder, almost always develops within the first 3 years of a child's life. Children and adolescents with cannot interact normally with other people. thus ....

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.... or structure. Recent studies estimate that as many as 14 children out of 10,000 may have autism or a related condition. About 125,000 Americans are affected by these disorders, and nearly 4,000 families across the country have two or more children with autism. Three times as many boys as girls have autism. Researchers are still unsure about what causes autism. Several studies suggest that autistic disorder might be caused by a combination of biological factors, including exposure to a virus before birth, a problem with the immune system, or genetics. Scientists also have identified chemicals in the brain and the immune system that may be invo ....