Concept formation is a crucial milestone for cognitive development. In the last 40 years, empirical evidence obtained in laboratory settings suggested that babies have a rich conceptual system that expresses in responses to stimuli. However, very little is still known about how concepts develop in every day, ecological contexts. This is due to a lack of studies addressing (i) the intersubjective contexts of activity in which concepts develop and (ii) the meanings that objects that are part of those contexts acquire (...) through material engagement. This paper presents a qualitative analysis of six observations from a longitudinal pilot study carried out at an infant school in Madrid (Spain), with children from ages 5 to 17 months. Children’s interactions with each other, with their teacher, and with objects were recorded every 21 days for 6 months. Results show that when children, in their first year of life, grasp the canonical uses of objects they stop interacting with isolated things and start to interact with members of functional classes. Knowledge about the canonical function of objects grants children access to new forms of interaction with the material world, with others, and with themselves. I, therefore, propose that, in early childhood, general forms of material engagement that take place within culturally organised activities are central to conceptual development. Specifically, I hold that canonical uses of objects are conceptual in nature. Results are discussed in relation to the need for more studies addressing the active role of material culture for cognition in early childhood. (shrink)