Health Secretary Robert F. Kennedy Jr. renewed controversial claims linking Tylenol (acetaminophen) use in pregnancy—and infant circumcision where Tylenol may be given—to increased autism risk. He acknowledged that no conclusive proof exists but said his agency is conducting studies to “make the proof.” He cited past studies that found correlations between circumcision rates and autism, though medical critics say those studies suffer from serious methodological flaws.

The scientific community has overwhelmingly rejected the assertions. Experts emphasize that correlation does not imply causation, and large, well‑controlled studies (including sibling comparisons) did not find a reliable causal link between prenatal acetaminophen use and autism.  Regulatory bodies in the UK and elsewhere have also reaffirmed that acetaminophen remains safe for expectant mothers when used appropriately.

Critics of Kennedy’s claims argue they are scientifically unsound and risky, especially when made by a high‑level health official. The Autism Science Foundation stated that any association between acetaminophen and autism is based on “limited, conflicting, and inconsistent science.”  Congresswoman Rosa DeLauro called the claims “baseless” and warned they could discourage pregnant women from using the safest available pain relief.

If you like, I can also break down what the relevant studies found (or didn’t find), and how medical bodies are responding.