If newborn deafness gene detection reveals that the infant exhibits a double mutation in the GJB2 gene at any site of c.35delG, c.176-191del16, c.235delC, or c.299_300delAT, the auditory nerve, auditory conduction pathway, and speech centre of the infant are normal, and a good rehabilitation effect can be obtained by cochlear implantation30. Here, GJB2 is linked to deafness.