America’s Children: Key National Indicators of Well-Being, 2007 is one in a series of annual reports to the Nation on the condition of children in America. In this restructured report, three background measures describe the changing population of children and provide demographic context and 38 indicators depict the well-being of children in the areas of family and social environment, economic circumstances, health care, physical environment and safety, behavior, education, and health. . . . In 2006, there were 73.7 million children ages 0–17 in the United States, or 25 percent of the population, down from a peak of 36 percent at the end of the “baby boom” (1964). Children are projected to compose 24 percent of the population in 2020.