In a Sept. 22 press conference that he had billed as “one of the biggest [medical] announcements … in the history of our country,” President Donald Trump touted an unproven link between autism and the use of Tylenol, or acetaminophen, during pregnancy.

Months ago, Health and Human Services Secretary Robert F. Kennedy Jr. had promised a press conference like this one pinpointing the causes of autism. In an Aug. 26 Cabinet meeting, Kennedy said that the administration will “have announcements, as promised, in September. We’re finding interventions, certain interventions now, that are clearly, almost certainly causing autism.”

But the press conference didn’t identify clear causes of autism. The administration’s suggestions about the role of acetaminophen go beyond what th

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