The present study looks into the largely unexplored territory of the cognitive underpinnings of semantic approximations in child language. The analysis of a corpus of 233 semantic approximations produced by 101 monolingual French-speaking children from 1;8 to 4;2 years of age leads to a classification of a significant number of them as instances of a set of principle-governed cognitive operations, including metaphor and metonymy-based cognitive operations, and conceptual complexes, such as metaphtonymies and double metonymies. The results shed light on cognitive operation preferences and their level of conceptual complexity at this stage of language development. Additionally, it points to the need to expand the inventory of functions traditionally assigned to these cognitive operations.