Much like those investigations, the latest review does not present a single "cause" for a child developing ASD or ADHD. However, no study has shown that acetaminophen, the main ingredient in Tylenol, causes autism. Professor Andrew Whitehouse, the Angela Wright Bennett Professor of Autism Research at The Kids Research Institute Australia, added: "Autism is a complex condition influenced by many genetic and environmental factors. The single study cited in this move by the FDA is a 2024 trial of just 40 individuals. "We know that autism is not just a disability," said Professor Simon Baron-Cohen, Director of the UK's Autism Research Centre.