This study used longitudinal cross-lagged modeling to examine reciprocal relations between maternal depression and child behavior problems. Data were drawn from 3,119 children (40% Hispanic, 30% African American, 20% White, and 10% other) from the Family and Child Experiences Survey of 2009 (a nationally representative sample of children served by Head Start). Results documented reciprocal relations between maternal depression and child behavior problems across early childhood (i.e., child age 3-5). Furthermore, the effect of child behavior problems on maternal depression was moderated by child race/ethnicity during children's first year in Head Start, such that the negative effect of child behavior problems on African American mothers' depression was more pronounced compared to Hispanics and other racial/ethnic groups. (author abstract)