Hearing loss is the most common congenital birth defect in the world. The incidence rate of permanent hearing loss accounts for about 20% of all birth defects, with the incidence rate ranging from 1/1000 to 3/1000. Normal listening is a prerequisite for people to learn a language, The brain needs both ears to receive external stimuli continuously before it can acquire language. If children with hearing impairment are not diagnosed and treated in time, they will lose the ability to socialize and learn, bring them difficulties in life and psychological trauma, and eventually become a burden on their families and society. Hearing impairment in infancy can cause devastating damage to language learning, causing children to be deaf and dumb. If Read More …