Sign Language

I was quite disappointed to learn that Baby Sign Language is used around 2 years old and up. Do people know that babies can actually talk at this age? Why use the sign language when actual speech is an option? Am I missing something here? I am running through the scenerios in my mind and I just don’t get it. Either spend the day teaching the kid to talk or spend it teaching him to make shadow puppets on the wall…hmmm, whatever shall I do? Baffles me really.