Hi,
as far as I know, children usually don´t wear RIC aids, they use tubes. With tubes, you can make the custom mold as small as needed. (with that style of aid, the receiver is inside of the aid and a tube goes out of it, the sound goes through the tube inside your ear). Usually, you have better sound with RIC, but if the smallest receiver is bigger than your ear canal, you might be better of with tubes. Good luck!