The diameter of the subglottis is 5.5 to 6 mm. If the subglottis is obstructed due to abnormal development, it is called congenital subglottic stenosis. It is caused by acute inflammation of the laryngeal mucosa, or by excessive fatigue of the vocal cords due to frequent mispronunciation. What are the prevention methods for congenital subglottic stenosis? There are no effective preventive measures for this disease. Early diagnosis and treatment is the key to prevention and treatment of this disease. The principles of treatment are to relieve respiratory distress, prevent shock, pay attention to rest, minimize neck activities, eat liquid food, give hemostasis, stop cough, apply antimicrobial and glucocorticoid hormones as appropriate, and closely observe the changes of injury. Determine the cause as soon as possible, treat symptomatically at an early stage, alleviate sore throat and cough, and pay attention to prevent the occurrence of comorbidities. Eating more vitamins B2 and B6 can promote the development of the skin is also beneficial to the development of the voice. Calcium can promote the development of thyroid cartilage, and care should be taken to chew and swallow slowly, not to gobble. Particular attention should be paid to eating fish to prevent fish spines from hurting the throat. And should eat some soft food and fine food, should not eat coarse, hard, dry food, etc., to prevent damage to the throat. Do not shout, get tired or sleep too much during the voice change period, and do not cause mood swings to prevent throat congestion and damage to the vocal cords. Reduce or remove secretions from the laryngeal cavity, thus reducing the breeding of bacteria. It helps to prevent the occurrence of pharyngitis. Patients with laryngeal stenosis have a long course of disease, ranging from 3 to 5 months for the shortest cases to 2 to 3 years or even longer for the longest cases, and require dilation therapy once every 2 to 3 months; therefore, home care of the child after discharge from the hospital is crucial. We should explain to the family how to clean and disinfect the cannula, how to care for the disease, and instruct the family how to observe the breathing and the change of face color, and come to the hospital in time to deal with any abnormality.