Brittiny Spears, 26, is not with the father of her daughter, Zykeiria, 4. "He just still wanted to go out and party and be a little boy," Spears says. Jennifer Ludden/NPR hide caption

itoggle caption Jennifer Ludden/NPR

For some kids who grow up in poverty, the bond developed with Mom is especially important in dealing with stress. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Students at Garfield Elementary School eat dinner as part of an after-school program in Kansas City, Mo. In the past few years, a federally subsidized school dinner program has spread from six to all 50 states. Charlie Riedel/AP hide caption

itoggle caption Charlie Riedel/AP