Arecent study compared the vaccination histories of 256 children with autism spectrum disorder with that of 752 control children across three time periods during their first two years of life. researchers found that . a combination of genetics, mental predisposition, and bad parenting combined with the mmr vaccination caused autism spectrum disorderb. delaying vaccinations lessened the odds that a child would develop autism spectrum disorder after a vaccinationc. quantity of immunogens from vaccines received during the first two years of life was related to the development of autism spectrum disorderd. the quantity of immunogens from vaccines received during the first two years of life were not at all related to the development of autism spectrum disorder