The battle over child labor fought in the United States at the end of the nineteenth and beginning of the twentieth centuries pitted emerging understandings about children's well-being against those of the rest of the family. As society grew more ethnically and economically complex, social reformers lobbied for greater regulation of children's behavior, thereby altering the family economy and women's and children's roles within it. The middle classes could afford nonproductive women and children, but many working-class, immigrant, and one-parent families could not. Yet, even within the less affluent strata of society, children in certain settings, ethnic and racial groups, and family structures were much more likely to be employed than in others. This article explores the variations in children's and mothers' labor in three very different settings: Pittsburgh, Fall River, and Baltimore between 1880 and 1920. It finds that child labor and education legislation resulted in a decrease in children's employment and increased the likelihood that mothers would take paid jobs.