Congenital hearing loss, as well as hearing loss present at birth, is one of the most common chronic conditions in children, with a prevalence of permanent bilateral hearing loss of 2.83 per 1000 children of primary school age, which is mainly caused by genetic factors. The goal of this observational study is to learn about novel causative genes in infants with hearing loss in the Chinese population. The main problem it aims to deal with are:
* to present the genetic characteristics of the infant with hearing loss in the Chinese population
* to build up a prognostic model base on diverse data.
Participants will be asked to receive audiological tests and collection of the peripheral blood sample.