“Hence, children aged 3 years old, are polynomial, i.e., capable of attributing several names to the same object (Deák & Maratsos, 1998).
In fact, a couple of researchers have demonstrated that even a baby has already an extended ability of categorisation that is not limited to empirical categories but attains also to more abstract forms of categorization.
For instance, from his/her seventh month of birth, he/she can deal with some categories of taxonomy (McDonough, & Mandler, 1998).
At the third month, using his/her gaze, the baby can show some
taxonomic biases (Quinn, Eimas, Rosenkrantz. 1993).”
Cognitive Development: Towards a Pluralistic and Coalitional Model, Cosmos and History: The Journal of Natural and Social Philosophy, Vol 16, No 2 (2020)