Both joint or separate participation in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) and the Food Stamp Program reduces the risk of child abuse or neglect and several nutrition-related health problems, such as anemia, failure to thrive, and nutritional deficiency. This study examines the relationship between WIC and Food Stamp Program participation and young children’s health and mistreatment outcomes. The analysis uses a unique individual-level longitudinal database that links administrative datasets on WIC and Food Stamp Program participation, Medicaid enrollment and claims, and child abuse and neglect reports in Illinois.