Dr. Steven Fleischman, president of the American College of Obstetricians and Gynecologists, worried that the Tylenol claims would terrify mothers-to-be and parents of children with autism. Here’s what we know about autism and the Trump administration’s new steps to address it. First, the definition of autism broadened as scientists expanded their understanding of its wide range of traits and symptoms. In addition, the Coalition of Autism Scientists said Monday that acetaminophen use during pregnancy hadn’t increased in recent decades like autism rates have. Any concern that vaccines could be linked to autism has been long debunked, stress scientists and leading advocacy groups for people with autism.