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Hearing aids are unlike cochlear implants in that they amplify sound, rather than directly stimulate the auditory nerve. These battery-operated devices receive sound waves via a microphone. The sound waves are then converted into electrical signals. You’re probably accustomed to seeing hearing aids on the elderly, but they may also be used for children as young as four weeks old. If your child is diagnosed with hearing loss, talk to his pediatrician about whether he might be a good candidate for a hearing aid.