One daughter wears two hearing aids, so it helps. I've been teaching ASL to my hearing son since 4 months. He is now talking at 14 months, but we still use the sign language. The ABC video is by far the best. The main attraction for my son is that you use children in your video.
Signing seems to help devolpment.
He signs multisyllabic words while speaking the monosyllabic words. Signing really helps our family communicate. Please let me know how I can obtain your next videotape. I appreciate everything you sent me. There are so many things available to occupy children and so few that I have come across have lasting and substantial value.