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About 20 years have elapsed since those studies were done. During this period, many changes that might influence teenage reproductive behavior and how it is viewed have taken place within the industrialized world. The proportion of births to unmarried women has risen,2 and nonmarital childbearing is more acceptable, both among adolescents and among women older than 20. Access to contraception and abortion in developed countries has improved, despite setbacks in some countries.3 Additionally, attention to sexuality education (from both conservative and liberal perspectives) has increased.4 The radical transformations in the political structures of the countries of eastern Europe have affected their economies and their youths’ prospects and reproductive behaviors, as well as their health care systems.5 Significant changes have also occurred in the systems of health care coverage in other developed countries.6 Susheela Singh is director of research and Jacqueline E. Darroch is senior vice president and vice president for research at The Alan Guttmacher Institute, New York. The authors thank Kathleen Berentsen, Yvette Cuca, Taylor Haas and Vanessa Woog for research assistance. We are also grateful to Nathalie Bajos, Beth Fredrick, Jennifer Frost, Stanley Henshaw, Sara Seims and Julien Teitler for comments on drafts of the article. This article was supported by a grant from the Ford Foundation. Adolescent Pregnancy and Childbearing: Levels and Trends in Developed Countries