Abstract: This essay introduces chiefly foreign achievements of research on the knowledge representations of 0-1.5 Years Old infants. It points out that the representation ability of infants develops from perceptions-based to meanings-based. Even very young infants have considerably complex ability of representation. They can represent the change of protypes and recognize different kinds of objects. They also can represent spatial relations, occlusion, number and causal relations. At the same time, they are able to understand agency to some degree ane form schemas and concepts gradually.

Key words: knowledge representations, agency, schemas.