"You are teaching," I said in response to your question about the baby. Is the baby learning or acquiring? And in either case, learning or acquiring what? We were talking about language & so I meant, at that moment, learning language. But the child might also have been learning about the shape(s) of human faces; and the shape(s) of human faces cannot be separated out from language. The baby might have been learning (but were you teaching?) the smell of another human's breath. I am skeptical of the psychologism of the word acquiring.