Two year old babies who cannot hear may be insensitive to sound and sleep unusually quietly. A two year old baby who cannot hear will have a certain impact on the baby’s daily life. When talking to the baby, there may be no response to speech, insensitivity to sound symptoms, and at the same time, sleeping is unusually quiet, and if the outside world is relatively noisy, it will not be able to wake up the baby. If the baby has such symptoms, it is recommended to take the baby to the doctor for examination, such as a full set of hearing test, to determine whether there are hearing abnormalities, and then treat the symptoms. Normally in life also need to communicate with the baby, more interaction, the baby’s growth and development has a certain help.