signing and sound effects

I've had a lot of people ask me if there is something wrong with my children since I am teaching them to sign. Absolutely not. There is nothing developmentally or physically wrong with them. We started signing because it's easier for babies to sign than it is for them to learn to speak. They sign earlier and are able to communicate with us. Even though they can not say monkey, bird, or kitty cat they can tell us if they see one by signing it. Studies also show that teaching babies to sign may increase their IQ so why not do it?