Doubtful. Disabled for tax purposes means unable to perform substantial gainful work. Most people with hearing loss can perform gainful work of some kind.
Also, there is no special credit even if the child was disabled and unable to perform gainful work. Having a disabled child changes the rules for the child and dependent credit when they turn 13, and may change the rules for claiming them as a dependent when they turn 19, but there is no credit or extra money.
