The pain reliever acetaminophen is recommended by many healthcare providers as safe and effective, even for pregnant women. However, a new study links frequent use of acetaminophen, especially in the second trimester of pregnancy, with a noticeable increase in problems with attention and behavior in young children. The research comes from the University of Illinois, the journal Neurotoxicology and Teratology and information collected from caregivers of more than three hundred children. Researcher, Megan Woodbury, who was pregnant during the study, says she does not want to scare others away from using acetaminophen in pregnancy when needed, such as severe headaches, but chooses not to use it for minor aches or slight fevers.