This study uses the dictator game paradigm of third-party punishment to explore the punitivebehaviour of third parties after they are influenced by the perception of baby faces of different roletypes. Experiments I and II explore how the baby faces of the violator (first party) and the person withcompromised interests (second party) affect the punitive behaviour of third parties, respectively. Theresults of Experiment I showed that third parties were influenced by the violator’s baby face in unfairsituations and mitigated the punishment of the baby -faced violator. The results of Experiment II showedthat third parties, both in relatively fair situations and unfair situations, punished the violator more whenthe person with the compromised interest was a baby face. The findings confirm that different role typesof baby faces both triggered cognitive biases in third parties’ perceptions of both the violator and theperson with compromised interests, which influenced third parties’ evaluations of different role types,which in turn led to idiosyncratic changes in third parties’ punitive behaviours.