It depends on the degree of deformation of the child's ear. If a little auricle can hang a traditional hearing aid, the size of the external auditory canal hole can be inserted into the soft earplug of the traditional hearing aid, which can match the common hearing aid. There is another case: there is no auricle, but the external auditory canal is not completely closed, and the left hole can be worn with a customized earphone sleeve or an ordinary earphone sleeve. If there is no auricle and there is no hole or small hole in the external auditory canal, in this case, a suitable bone conduction hearing aid should be given to the child first, and then a suitable ordinary air conduction hearing aid should be given to the child after auricle plastic surgery and external auditory canal reconstruction surgery. You can take your child to a large local professional hearing institution for consultation first.