The funny thing about this age is that the kids start making all kinds of faces at the adults. But for the most part, I doubt it really means anything. For the most part they’re learning by imitating and trying things out and seeing what kinds of reactions they get. But we can’t help but ascribe intentions to their facial expressions. Then again, we do this with inanimate objects, it’s part of what makes us human. (Or at least puts us in a small category of animals)