This study examined the developmental trajectory of a potential source of resilience, prosocial behaviors, and children's peer victimization from third to sixth grade. Trajectories were examined for 1091 children (540 females, 81.4% Caucasian) from Phase 3 of the NICHD Study of Early Child Care. Latent growth mixture modeling indicated that three latent classes emerged (labeled resilient, at-risk, and normative). Follow-up analyses with covariates further supported the presence of these classes. The resilient class, of particular interest in this study, indicated high initial, but dramatically decreasing victimization coupled with high-stable prosocial behaviors over the 4-year period. These findings suggest the potential protective function of engaging in prosocial behaviors for victims and highlight the need to examine potential heterogeneity among victims. (c) 2016 Elsevier Inc. All rights reserved.