The main reason for babies sleeping with their mouths open and snoring is airway narrowing, especially poor nasal ventilation caused by adenoid hypertrophy, tonsil swelling, allergic rhinitis, turbinate hypertrophy or deviated nasal septum, which can lead to open-mouth breathing or snoring in children. In addition, some children have narrow airways due to obesity, and some children have small jaws, and small jaws because the jaws will retract, which will lead to snoring and open-mouth breathing. The backward fall of the tongue obstructs the airway during sleep, which can even cause apnea and lack of oxygen to the brain in severe cases, resulting in easy fatigue, decreased memory and inability to concentrate in children. Breathing through the mouth can also cause excessive protrusion of the maxillary front teeth or the upper lip is too short, the lips cannot be closed naturally, and the open lips and teeth do not look good and affect the beauty. This shows that do not underestimate the sleep snoring and open mouth breathing, the long-term harm is not small, if you sleep like this every day, you should go to the hospital to do a checkup, by a professional physician to give solutions.