There is nothing the person who lost their hearing or born deaf or hard of hearing will never hear the "normal" hearing. She or he may heard something but it is very faint when it come with mild or severe hearing loss. That is why we need to accept deafness and live with it for the rest of our lives. Hearing aids and CIs are not able to help them hear sound clearly and it is always noises often. With CI, I learned that they only hear like a robot sound which is not normal hearing. They can hear sounds that they can make out but not that clearly and won't be able to hear that far if you are talking about birds singing or the waterfall. They need to come close up enough to hear noise but not clearly. You just can not bring "normal" hearing the way you want deaf child or hard of hearing child to have a normal hearing. But the way you say that you want and wish for the deaf child to hear normal. That will never happen.