Children breathing phlegm sound, often suggests that there are respiratory tract infections, such as common diseases such as colds, bronchitis, pneumonia, etc., mostly due to bacterial and viral infections. Need to consult a doctor in time, and due to the child’s body resistance is often weak, usually need timely treatment, if the disease is controlled, then the child’s respiratory phlegm sound does not matter. If the disease is under control, then it does not matter. If there is a long delay, not active treatment, or poor treatment, the occurrence of respiratory failure, febrile convulsions, bacteremia, etc., then it is more important. For children’s respiratory phlegm sound symptoms, if it is due to bacterial infection, should take cefaclor, amoxicillin and other antibacterial treatment, if it is due to mycoplasma infection, need to use azithromycin and other antibiotic treatment, if it is due to viral infections caused by the use of antiviral drugs such as oseltamivir and symptomatic treatment, usually after timely treatment can be effective in controlling the disease, it does not matter; if the treatment is late, not on time to use the drugs, it is not important. If the treatment is late, or the medication is not given on time or incorrectly, serious situations may occur. For example, if the infection affects the respiratory function, respiratory failure may occur, which is more dangerous; febrile convulsions may lead to generalized convulsions, which may cause gastric reflux to the lungs and cause aspiration, which may lead to asphyxiation; and bacteremia may lead to infectious shock, which may be life-threatening. In addition, congenital laryngeal stridor can be due to abnormal laryngeal soft tissue relaxation, resulting in inhalation of the tissue collapses inward, blocking the upper pharyngeal orifice, which can also be caused by the child’s inhalation of similar phlegm sound, the child is only in the inhalation of phlegm sound, but crying and coughing sound is normal, no difficulty in feeding, the general does not matter, no special treatment, can disappear on its own. However, when there is an abnormality in both exhalation and inhalation, the symptoms are usually more serious, or cause feeding difficulties, choking, respiratory distress, etc., it is more important, and if not promptly performed epiglottis, supraglottoplasty or other surgical treatments, it may lead to slow growth and development, or even respiratory failure, which may be life-threatening.