Estimates the number of infants exposed to legal and illegal substances before birth, drawing on 27 published reports and National Institute on Drug Abuse data. The following are estimated exposure levels: (1) cocaine, 2-3 percent; (2) marijuana, 3-12 percent; (3) cigarettes, 38 percent; and (4) alcohol, 73 percent. (SLD)

Reviews the effects of prenatal exposure to the following: (1) cigarettes; (2) alcohol; (3) heroin; (4) narcotics; (5) marijuana; and (6) cocaine. Also discussed are the effects of exposure to multiple drugs and research issues in assessing drug effects. The importance of environment in long-term outcome is emphasized. (SLD)