Since 1965, the Head Start program has served low-income 3- and 4-year-old children and their families with comprehensive early education and support services. Programs provide services focused on the "whole child," including early education addressing cognitive, developmental, and socio-emotional needs; medical and dental screenings and referrals; nutritional services; parental involvement activities and referrals to social service providers for the entire family; and mental health services. In 1994, the federal Early Head Start program was created to address the comprehensive needs of low-income children under age 3 and pregnant women. All Head Start programs are required to complete the Program Information Report (PIR) on an annual basis. Based on information reported through the PIR, this fact sheet describes the characteristics of Head Start children and families (including children in Early Head Start, the Head Start preschool program, and Migrant and Seasonal Head Start) and the services provided to them during the 2005-2006 program year. In 2006, the Head Start program served 1,080,627 young children and 10,825 pregnant women through 2,696 grantees throughout the country--about 26,000 more children and 340 more pregnant women than in 2005. (Contains 4 footnotes.)