“People were followed for periods ranging from three to 11 years, depending on the study, using questionnaires, interviews, and self-reports on medication use.The analysis revealed a 20% higher risk of autism and a 30% higher risk of ADHD for children who had prolonged exposure to acetaminophen during fetal development.

However, it noted that taking small amounts of acetaminophen during pregnancy — in one study, for fewer than eight days — didn’t increase risks.

Other studies since then have supported earlier findings that too much acetaminophen may increase one’s risk for autism and ADHD.”

Cleveland Clinic (https://health.clevelandclinic.org/pregnancy-does-acetaminophen-heighten-risks-for-autism-adhd/)