Interaction within mothers’ social networks, reinforced by promoting positive social norms for appropriate behaviors, can affect IYCF practices, according to this study in Bangladesh. The study used household surveys to trace the paths of exposure to interventions like interpersonal counseling, community mobilization and mass media. Findings conclude that through networks, diffusion and norms, exposure to large-scale social and behavior change interventions will contribute to sustained positive changes in IYCF.