Health and Human Services Secretary Robert F. Kennedy Jr. stunningly claimed Thursday there may be a link between circumcision and autism — due to distribution of Tylenol to infants following the procedure.
“There’s two studies which show children who are circumcised early have double the rate of autism, it’s highly likely, because they were given Tylenol,” Kennedy told President Trump during a cabinet meeting.
Kennedy didn’t specify the research to which he was referring, but a 2015 study out of Denmark that tracked nearly 343,000 Gen Z boys suggested that circumcised males were more likely to develop autism before the age of 10 compared to their uncircumcised peers.
Health and Human Services Secretary Robert F. Kennedy Jr. claims Tylenol use after a circumcision procedure could be linked to autism. Bonnie Cash/UPI/Shutterstock
Researchers hypothesized that pain and stressful surgery early in life can increase the risk of neurodevelopmental, behavioral or psychological problems later on.
However, some critics called the research “flawed” and said the study authors should have examined other painful conditions such as urinary tract infections, which are common in young children.
Another possible explanation for the purported link is that boys who undergo circumcision are more likely to interact with health care workers, leading to a higher detection rate of autism.
A second, smaller 2024 study out of Ireland found that circumcised boys with autism “exhibited significant improvements” in irritability, sensory issues and repetitive behavior compared to their uncircumcised peers.
The researchers also reported that urinary symptoms such as pain, urgency and the need to go at night were “significantly reduced.”
Rabbi Nechemia Markovits, a fifth-generation certified mohel and circumcision specialist based in Brooklyn who’s performed the ritual for nearly 40 years, said he has never needed to recommend Tylenol after performing the procedure on a newborn.
“The procedure is quick and well-tolerated,” he told The Post.
Robert F. Kennedy Jr.’s claims come shortly after the HHS secretary claimed that Tylenol is “not good” for pregnant women. AFP via Getty Images“I place a light gauze with Vaseline to protect the area, and if there’s any mild discomfort, parents can use a gentle topical spray on the first day. Every family has direct access to me afterward through WhatsApp, and I guide them personally through the healing process until everything is completely healed.”
For older children, Markovits said a proper dose of Tylenol can ease short-term soreness.
“I’ve never had newborns use Tylenol,” he said, later adding: “My focus is simply on providing safe, comfortable, and natural healing for each patient.”
In a subsequent statement on X, Kennedy added: “An August 2025 Preprints.org review by Patel et al. directly validates my point that the observed autism correlation in circumcised boys is best explained by acetaminophen exposure, not circumcision itself.”
“The paper I was referring to identifies the 2015 Danish circumcision study as ‘the most compelling ‘standalone’ evidence that acetaminophen triggers autism in susceptible babies and children,’” the HHS secretary noted.
“In short, the preprint provides a rigorous scientific framework that substantiates my interpretation: the risk stems from acetaminophen use in infants, not from circumcision itself.”
Kennedy’s remarks took place two weeks after President Trump declared that acetaminophen, sold under the brand name Tylenol, is “not good” for pregnant women unless they have a high fever — warning it could increase the baby’s risk of developing autism.
Some critics called the research in the 2015 study “flawed.” Yakov Stavchansky – stock.adobe.comThe over-the-counter medication is used to relieve mild to moderate pain and reduce fever, with medical experts insisting Tylenol’s been safe for the 70 years it’s been on the market.
The president urged mothers to “tough it out” if they are in pain and pushed the Food and Drug Administration to update Tylenol’s label with a warning about a possible link between prenatal use and brain development issues in babies.
While Trump’s comments sparked swift backlash from women and the medical community, he doubled down on his position following Kennedy’s wild claim Thursday.
“There’s a tremendous amount of proof or evidence, I would say as a non-doctor,” said the president, adding that he studied the controversial topic “a long time ago.”
“Just don’t take it. You have to tough it through sometimes. I’m addressing it as best I can as a non-doctor, but I’m a man of common sense.”
Diagnosis rates for autism have risen 400% since 2000 and 1 in 31 American children are now affected.
