Wow my son learn very little sign language when he was a tolddler and didnt pick up english so the doctor order him to go to early intervention and it help alot and he was picking up really fast. So most of the time we speak. Sometimes I used sign language so I could understand what he was staying. I wish he sign more to me so I may one day lose my hearing completely.
Do what Shel90 said and I agree with her.