President Donald Trump is expected to make what the White House is calling a historic announcement. He told reporters he believes the use of the painkiller acetaminophen during pregnancy is a very big factor in raising the risk of autism.

Thats raising questions for many families.

There are some earlier studies that suggested a possible link between autism and acetaminophen, the active ingredient in Tylenol. An August review by Mount Sinai and Harvard researchers this year found a possible link. They recommended caution: using only the lowest effective dose for the shortest time during pregnancy and while under medical supervision.

But heres the thing: the studies in this review were small and didnt prove cause and effect. Whereas larger, stronger studies including one that looked at mo

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