Autism may occur for specific families, so researchers believe that genetic details may prepare the child for infection, although other risk factors may increase the likelihood of having a child with autism spectrum. The age of the mother or the great father may be one of the factors, Drugs, chemicals and alcohol during pregnancy, some diseases such as rubella, obesity and diabetes, as well as the things referred to when talking about the factors of autism is the vaccines although there is no evidence to confirm this to now.