UNFPA: (United Nations Population Fund), for Population Activities, improving reproductive and maternal health worldwide. UNICEF: (United Nations Children's Fund), providing humanitarian and developmental aid to children worldwide. U.N. headquarters is in New York City. UNESCO: (United Nations Educational, Scientific and Cultural Organization) promoting world peace and security through international cooperation in education, the sciences, and culture. UNDP: (United Nations Development Programme). promotes technical and investment cooperation among nations and advocates for change and connects countries to knowledge, experience and resources to help people build a better life for themselves.