Children sleeping with open mouth breathing, parents can first change the child’s sleeping position, as far as possible is the side position, while sleeping pillow must be placed in a good position can not be too high or too low, after symptomatic treatment to observe the sleeping situation. If the mouth is still open, you can consider going to the hospital for a detailed examination, including the pharynx, nasal cavity, nasopharynx, preferably nasal endoscopy, laryngoscopy, to be able to clearly observe where the specific condition is. If it is due to tonsil hypertrophy, you can consider removing the tonsils, if it is due to adenoid hypertrophy or rhinitis, you can consider using medication, commonly used is budesonide nasal spray or mometasone furoate nasal spray, you can also add the appropriate use of nasal abyssal particles to treat.