At delivery, cord blood will be obtained (the newborn will NOT need a blood draw) and this sample will go the laboratory for an acetaminophen level of the fetus.In order to maintain blinding, all 150 cord blood samples will be sent for testing and results will blindly be reported to the Pharmacy.Pharmacy personnel will also keep cord blood levels. No action by the pharmacy personnel for monitoring of cord blood levels will be necessary, as there are no cord blood therapeutic levels available. This study will seek to discover that information.