Sorry for the delay in answering your important question. This is very sad news. Was he ill or hospitalized? Was he in an accident? Maybe he had a child illness like measles, chicken pox or mumps, or meningitis which are causes of hearing loss. Over time his speech and language will deteriorate because he cannot hear the sounds correctly BUT usually this will not happen overnight. In this case the audiologist and pediatrician should work together in order to determine his degree and type of hearing loss and possible causes and treatment options. Hope this help and good luck
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