This report by Lorraine Klerman, DrPH, summarizes what is known about additional births to teen mothers, the dimensions of the problem, the factors that seem to increase the chances of such births occurring to teen mothers, their consequences, and the potential for prevention. The primary focus of the 49-page report is a critical review and assessment of programs. This report closely examines what types of programs are most effective in preventing additional pregnancies and births to teen mothers.