More than 30 sleep apneas at night or more than 5 per hour in children is considered severe. A series of manifestations caused by frequent partial or total upper airway obstruction during children’s sleep, which disturbs the normal ventilation and sleep structure during sleep, is called childhood sleep apnea syndrome. The main manifestations are snoring, open-mouth breathing, breath-holding, recurrent awakenings, and excessive sweating at night, and increased activity during the day, accompanied by speech defects, decreased appetite, and swallowing difficulties. Signs include dyspnea, nasal flaring, intercostal and supraclavicular depression, and contradictory chest and abdominal movements during inspiration. Sleep apnea in children can also lead to complications such as hypertension, pulmonary edema, pulmonary heart disease, arrhythmia, congestive heart failure, respiratory failure, and even sudden infant death syndrome. If you find that your child has the above symptoms, you should seek medical attention in a timely manner and undergo regular treatment as soon as possible to minimize the adverse consequences of the disease.