Every child reinvents the concept. It wasn't there on birth, and the word and phrases didn't contain it. That's a bit difficult topic to wrap ones head around, but it is critically important to differ between signified (the concept) and signifier (the words etc.).

The child develops concepts and is able to create and evaluate inferences, and thus able to understand metaphors etc.

The concept is what most AI approaches lack. Googles image search can identify apples, and cherries, and probably can categorize both as fruits, but it can't infer that this probably contains seeds, is a living being etc.