To establish the prevalence of battering during pregnancy, 290 black, white, and hispanic women attending public and private prenatal clinics were randomly selected and interviewed. In all, 36 percent had been battered or were at risk for battering. Injuries included slaps, kicks, punches, broken bones, choking, and sexual assault. None of the pregnant women reported being assessed for abuse by their health care provider. To prevent the battering of pregnant women, an educational program was initiated based on a model of behavior change. Behavioral change expected was increased knowledge and routine abuse assessment by health professionals. This program was applied to 841 health providers working with pregnant women. After completing the program, 75 percent of the participants were assessing pregnant women for physical abuse or in the process of developing an assessment protocol.