Henry is just past 15 months now. He doesn't say anything intelligible, but he babbles a lot and chats on the telephone. He uses a few signs in makaton-type sign language to get what he wants. He's starting to walk a bit more, but we're not ready to invest in shoes for him yet. He also knows how to use the remote control to turn the TV on, and likes to watch and play videos on youtube. Is there a pattern?