Pregnant moms using acetaminophen during pregnancy could be increasing the risk of their child developing attention deficit hyperactivity disorder.  

A new study by researchers in Denmark found ADHD was more likely to develop in children whose mothers took the common over-the-counter medication while pregnant.  

The findings don't prove a cause-and-effect relationship between the drug and the disorder, but they do suggest that more research is needed.  

Acetaminophen is found in Tylenol and many other pain and fever remedies.