Without enough diapers, children are at risk of serious health problems like rashes and infections, and parents may miss work or school, undermining family stability and economic mobility. Federal programs that help families purchase food and nutrition supports and provide cash assistance in times of need, like the Supplemental Nutrition Assistance Program (SNAP), the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC), and Temporary Assistance for Needy Families (TANF), do not cover diapers, requiring parents to pay high out-of-pocket prices. This Urban Institute factsheet sheds light on the widespread and often hidden crisis of diaper insecurity, its impact on family well-being, and the gaps in public support.