United Nations Statistics Division - Demographic Yearbook
Statistics on population size and composition, births, deaths, marriage and divorce.
http://unstats.un.org/

United Nations Children's Fund - UNICEF
The State of the World’s Children 2008 assesses the state of child survival and primary health care for mothers, newborns and children today.
http://www.unicef.org/

United Nations Statistics Division - Millennium Development Goals
Official data, definitions, methodologies and sources to measure progress towards the Millennium Development Goals.
http://unstats.un.org/