Babble or Talking?

I can see why many kids don't really have a "first word". Tyler babbles quite a bit and it is hard to tell if he is actually forming words and relating them to items. He says "mama" and "dada" but not directed at us. It sounds like he has been saying "hi". And Tyler's new favorite term is "uh oh", which he declares after tossing his sippy cup from his high chair.