Baby ASL

Has anyone ever had success teaching their little ones sign language. Both Charlotte's audiologist and Speech therapist said we should probably start soon. Charlotte is deaf in one ear and we don't know her cognitive our look yet, so sign language is a good step in communication in the future. I guess it's not too early to start because we already talk to our babies, why not sign to them too. Anyway, my signs are pretty limited. Does anyone know a good program or resources that has worked for them in the past?