According to a recent study, the incidence of neonatal abstinence syndrome (NAS) increased threefold in the US between 2000 and 2009. NAS occurs in babies who have been exposed to prescription drugs during pregnancy. Illegal prescription drug use continues to plague many communities throughout the country, and drugs like heroin, morphine, codeine and Oxycontin were found in mothers getting ready to deliver at five times the rate during this same time frame.