Overview

• President Trump told pregnant women not to take acetaminophen and questioned childhood vaccination, asserting a high autism risk without evidence.
• WHO said no causal link has been established between prenatal acetaminophen exposure and autism and reiterated that vaccines do not cause autism.
• European and UK regulators reaffirmed that acetaminophen can be used in pregnancy, advising the lowest effective dose for the shortest duration.
• Evidence remains mixed, with an August 2025 Environmental Health review suggesting a possible association contrasted by a 2024 JAMA study of 2.5 million Swedish children finding no autism link and experts noting confounding factors such as maternal fever.
• The administration announced research funding, promoted folinic acid for some autism forms, and appointed a controversial researcher, while the Washington Post reported the FDA plans label updates and a physician letter and the agency issued more cautious language.