All authors are members or contributors to the American Heart Association’s Policy Research Advisory Group (PRAG), which provides guidance in advancing equity in policy and research for Voices for Healthy Kids and the National Collaborative of Infants and Toddlers. The PRAG thanks the Pritzker Children’s Initiative for its support of this work and thanks staff from the following agencies for helping to inform this manuscript: the Rhode Island Department of Health’s Center for Vital Records; the State of Rhode Island Executive Office of Health and Human Services; the Massachusetts Department of Public Health’s Bureau of Family Health and Nutrition and Registry of Vital Records and Statistics; and the New York City Department of Health and Mental Hygiene’s Bureau of Vital Statistics.