More than 45 percent of infant and young child deaths are attributable to undernutrition. However, as this article points out, donor funding for nutrition services is less than 1 percent of donor investment in development as a whole. Despite proven solutions to screen and treat children, underfunding hinders large-scale progress with enormous consequences. A range of stakeholders—from governments, development banks, and civil society to philanthropies and the private sector—play a critical role in increasing funding for nutrition.