I do this regularly. As I told Hubby this morning, when I say something out loud, it makes more sense, or I see the absurdity of it. Pre-Peanut I tried to keep this talking to a minimum when out and about at stores and such. But these days, I just "talk to Peanut".
I'm sure he gets something out of it, word acquisition and such. But goodness, it makes life easier to me!