Baby mute, mainly including hearing abnormalities and language function abnormalities, to determine whether the baby can speak and hearing situation, need to carefully observe the baby and other babies language, hearing, there is no developmental differences, especially the ability to respond to sound, and language, all need to be carefully observed. If the baby is mute, generally in crying will not make a sound, the child in crying only tears, no crying sound, and as they grow older, will not make ah, babbling and other sounds. In addition, you can call on the baby or play music and observe whether the child pursues or reacts to the sound. If there is no response, you need to go to the ENT department of the children’s hospital for a hearing test. If the hearing test result is normal, but the child cannot pronounce sounds, you need to have the vocal cords and other articulatory organs examined to see if the child’s vocal cords are developing normally.