A set of two longitudinal analyses of data from the National Institutes of Child Health and Human Development Study of Early Child Care (NICHD SECC). The first analysis investigates the effects of maternal employment, work/family attitudes, and childcare on mothers' responsiveness to their children in the first four years of their children's lives; the second analysis examines changes in mothers' perceptions of the relative rewards and strains of being employed during their children's first three years of life.