Keeping friends in mind: Development of friendship concepts in early childhood

Friendship is a fundamental part of being human. Understanding which cues indicate friendship and what friendship entails is critical for navigating the social world. We survey research on 3- to 6-year-old children's friendship concepts, discussing both classic work from the 1970s and 1980s using interview methods, as well as current work using simpler experimental tasks. We focus on three core features of young children's friendship concepts: (1) proximity, (2) prosocial interactions, and (3) similarity. For each, we discuss how recent findings extend and expand classic foundations. Importantly, we highlight that children's knowledge develops earlier and is deeper than initially hypothesized, and how children's abilities are supported by early social inferences in infancy. We examine the implications of young children's friendship concepts and note exciting new avenues for future research.