President Donald Trump said his administration was linking acetaminophen, the active ingredient in Tylenol, to autism and urging pregnant women to largely avoid the medication. “So taking Tylenol is not good — I’ll say it — it’s not good. For this reason, they are strongly recommending that women limit Tylenol use during pregnancy unless medically necessary,” Trump said Monday at a White House event alongside Robert F. Kennedy Jr., his health secretary. Monday’s announcement was the latest example of how Kennedy and Trump have sought to upend health guidance and practices in their administration. While there have been numerous studies into the cause of autism, decades of scientific research have yet to identify just one cause for the condition.

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