The main purpose of this thesis was to further explore factors that render particular children more susceptible to bullying and peer victimization. Race, age, and the activities that the children participated in were considered potential predictors of bullying and victimization. Self- and peer-reported data were gathered on 437 first and third grade children (234 boys and 203 girls, M age = 7 years, 6 months), including the frequency of peer victimization and the extent of their engagement in gender-typed activities. Activities were identified as either masculine (e.g., watching sports on television, playing with tools) or feminine (e.g., playing house, cheerleading) according to which sex was mostly likely to engage in them. Mixed support was obtained for the hypothesis that boys are at greater risk for being targets of peer aggression. Specifically, while peer-reports of victimization supported this hypothesis, self-reports revealed no sex differences. Support was obtained for the hypotheses that engaging in cross gender-typed activities would be a stronger risk factor for peer victimization for boys than for girls.