It was around fourteen/fifteen months old that I began to wonder because the pediatrician seemed stunned that he would look at flash cards of shapes and tell me what shape and color they were, especially when I said he had been doing it for a while. The look she gave me was truly stunned. (We weren't training him on flash cards- I had them because he loved his shape sorter and he loved to talk about shapes and colors and I thought he would enjoy looking at the cards and telling me the colors and shapes when we had to wait somewhere. He knew them before we bought the cards.