In this article, I briefly review theories about the development of theory of mind, and then examine evidence for minimalism, the idea that infants initially understand only behaviors. To this end, I consider the need for a wide variety of species to predict the behaviors of other animals and that human infants are not unique in this regard. I also discuss evidence for infants' understanding of behaviors, including their good statistical learning skills and their rich exposure to patterns of behavior, which correlates with their acquisition of mental state vocabulary. Finally, I discuss evidence for how maternal mental state talk, as well as children's evolving language and understanding of self, contributes to learning that mental states underlie behaviors.