there is a correlation between autism and use of Tylenol during pregnancy.

[0] (via [1]) says no - "analyses of matched full sibling pairs found no evidence of increased risk of autism (hazard ratio, 0.98), ADHD (hazard ratio, 0.98), or intellectual disability (hazard ratio, 1.01) associated with acetaminophen use [...] a population-based sample of 2 480 797 children"

[0] https://jamanetwork.com/journals/jama/fullarticle/2817406

[1] https://www.nih.gov/news-events/news-releases/study-reveals-...