The president delivered impassioned — if scientifically dubious — remarks about what he described as one of “the most alarming public health developments in history.”

President Trump urged pregnant women to avoid acetaminophen, the active ingredient in Tylenol, claiming it could cause autism. Studies about the link have been inconclusive.

The president delivered impassioned — if scientifically dubious — remarks about what he described as one of “the most alarming public health developments in history.”

How President Trump ignored science about vaccines in his news conference.

Some welcomed more research and possible new treatments. But the administration’s embrace of unproven science and depiction of autism as a “crisis” has sown deep mistrust.

President Trump has used his position of authority to dole out flawed medical advice dating back to his first term, when he mused about injecting bleach to kill off the…