...It's funny. I can't stand baby-talking little kids, maybe because I was never spoken to that way myself. But I am constantly cooing and making baby noises at my cats, at least one of whom is smart enough to identify words that mean things to her (her name, "treat," "food," "play"... yeah, ten years old and she's gonna be a kitten forever).
And honestly? No shame whatsoever. I'd sooner talk silly to my cats than to a human child who will grow up with that in their heads. :S