From NPR.

The Trump administration is telling pregnant women not to use acetaminophen, the active ingredient in Tylenol, to avoid having kids with autism — despite the fact that medical groups say there’s no clear evidence showing a causal link.
The National Institutes of Health also recently awarded more than $50 million in research grants to explore the roots of autism. The director of the NIH, Jay Bhattacharya, says the new grants will help scientists consider the effect of environmental and medical factors — everything from nutrition to pollutants.
He says past NIH research on autism has not given families the answers they wanted. The NIH did, however, fund one very large study looking at acetaminophen use in pregnancy and the risk of autism. It analyzed data from more than two million children in Sweden and found no connection.