Tylenol (acetaminophen) does not cause autism. Large, recent high-quality studies, including one published in 2024 analyzing data from 2.5 million children, found no causal link between acetaminophen use during pregnancy and autism after controlling for genetic and environmental factors shared between siblings. Although some studies suggested slight associations, these were likely due to confounding factors such as genetics or socioeconomic status rather than a direct effect of the medication. Leading health organizations and experts agree that there is no definitive evidence supporting a causal connection between Tylenol and autism. However, some recent research highlights possible associations between acetaminophen use in pregnancy and a slight increase in risk of neurodevelopmental disorders, including autism and ADHD, but these findings are still under investigation and do not establish causation. Public health guidance remains that acetaminophen should be used cautiously during pregnancy, only at the lowest effective dose and shortest duration, under medical supervision. In summary, the consensus of the best available evidence is that Tylenol does not cause autism, though research continues to examine any potential subtle risks.