Children develop rich concepts of social categories throughout early and middle childhood. Whereas we know much about the development and consequences of many social categories individually, we know less about the development of representations at the intersection of multiple categories--for instance, how children think about race and gender together. This is a critical issue because every person a child meets holds membership in multiple social categories. Thus, overlooking how children integrate information about multiple categories causes a major gap in our understanding of the development of social cognition. An intersectional framework, which considers both how group-based bias is expressed toward people with one versus multiple minoritized identities and how power structures shape these processes, can help address this issue. In this article, we review research on children's use of race and gender, and describe how an intersectional framework can address gaps in knowledge and advance both equity and theory.