Nine-month-old baby mute voice, this situation if the weather is relatively hot, may be the child on fire caused by throat inflammation, but also may be the upper respiratory tract infection, wind heat, cold caused by acute pharyngitis. In this case, it is recommended that the child should not shout, and you can give him more warm water as appropriate. If the hoarseness of the voice is very strong, it is best to recommend local nebulizer treatment, of course, some children do not cooperate, then you need to feed the parents diligently water, you can take a little heat, detoxification with anti-viral nature of the traditional Chinese medicine, such as PuDiLan anti-inflammatory oral solution, and so on. But we need to be vigilant, if the child has a barking cough or hoarseness is particularly strong, can not make a sound, especially at night when sleeping, the voice like snoring sound, snoring sound, this situation is recommended to go to the hospital to rule out acute laryngitis. Because the child’s condition changes rapidly, especially at night, this situation should not be taken lightly, because laryngitis is serious, it will endanger the child’s life.