A revision of 16 newborns and their heroin-addicted mothers was carried out. The mean maternal age was 23.06 +/- 3.43 years, and mean duration of addiction was 3.07 +/- 1.43 years. The last dose of heroin was administered less than 24 hours prior to giving birth in every [corrected] case except one. Antenatal care was irregular and previous abortions were frequent. Two mothers had a history of syphilis, five had markers for anti-HIV antibodies. The mean duration of pregnancy was 37.8 +/- 2.28 weeks, and unknown in five cases. Mean birth weight was 2.715 +/- 281 g. Withdrawal symptoms were observed in 13 babies. Of these, 12 required treatment with phenobarbital and in 1 case with chlorpromazine as well. In 9 babies, hepatitis B prophylaxis was carried out and three had HIV antibodies.