Some 73 percent of children under age 5 with working mothers are regularly in child care, data from the 2002 National Survey of America's Families shows. Children in low-income families are more likely than higher-income children to be placed in relative care (30 percent compared with 24 percent). Data also reveal that 46 percent of higher-income 3- and 4-year-olds are in center-based care compared with 36 percent of low-income children.