Please don't, a 2yr old kid should basically play and have fun imho, there's so much time to experience the absolute misery of mathematical frustration.
Also, Uni chooses what they do and when they do it. This includes diaper changes and baths. We seek to, at most, influence through what we say/do and configure the environment. We also moderate their food intake when it comes to things like sugar.
So with that in mind, does that change your answer at all?