March of Dimes is a United States nonprofit organization that focuses on improving the health of mothers and babies. The organization's mission has evolved over the years to address broader issues related to maternal and infant health, including prematurity, birth defects, and infant mortality. The March of Dimes supports research, provides education, and advocates for policies that improve health outcomes for mothers and babies. It also funds research into conditions like preterm birth, congenital disabilities, and genetic disorders.