Small but significant gender differences in emotion expressions have been reported for adults, with women showing greater emotional expressivity, especially for positive emotions and internalizing negative emotions such as sadness. But when, developmentally, do these gender differences emerge? And what developmental and contextual factors influence their emergence? This article describes a developmental bio-psycho-social model of gender differences in emotion expression in childhood. Prior empirical research supporting the model, at least with mostly White middle-class U.S. samples of youth, is presented. Limitations (...) to the extant literature and future directions for research on gender and child emotion are suggested. (shrink)