"The review looked at more than three dozen studies and found no evidence that acetaminophen increased the risk of neurodevelopmental disorders in children."

"A scientific review of 43 studies on acetaminophen use during pregnancy concluded that there was no evidence that the painkiller increased the risk of autism or other neurodevelopmental disorders.

“We found no clinically important increase in the risk of autism, A.D.H.D. or intellectual disability,” Dr. Asma Khalil, a professor of obstetrics and maternal fetal medicine at St. George’s Hospital, University of London, and the lead author of the report, said at a news briefing. The study was published on Friday in the British medical journal The Lancet.

Acetaminophen, the active ingredient in Tylenol, remains “the first-line treatment that we would recommend if the pregnant women have pain or fever in pregnancy,” Dr. Khalil said.

Studies that have examined a possible link between acetaminophen in pregnancy and a risk of neurodevelopmental disorders have produced conflicting data, with some finding no connection and others finding small increases in risk."

Azeen Ghorayshi reports for the New York Times January 16, 2026. [2]