What causes autism in babies?

In some cases, autism has been linked to untreated phenylketonuria (called PKU, an inborn metabolic disorder caused by the absence of an enzyme) and rubella (German measles). ... Researchers have no evidence that a child's psychological environment -- such as how caregivers treat the child -- causes autism. read more

Experts are still uncertain about all the causes of autism. In all likelihood, there are multiple causes – rather than just one. It appears to be that a number of different circumstances — including environmental, biologic, and genetic factors – set the stage for autism and make a child more likely to have the disorder. read more

Prenatal viral infection has been called the principal non-genetic cause of autism. Prenatal exposure to rubella or cytomegalovirus activates the mother's immune response and greatly increases the risk for autism. Congenital rubella syndrome is the most convincing environmental cause of autism. read more

Autism spectrum disorder is a disability that affects development. The word spectrum refers to the range of symptoms and their severity. Kids with ASD have problems with social skills, language, communication, and behavior. read more