Children can not breathe through the nose may be nasal diseases, adenoid hypertrophy, tonsillar hypertrophy and other diseases, can be resolved through general treatment, drug treatment or surgical treatment. 1. Nasal diseases: If there is chronic inflammation or allergic rhinitis in the child’s nasal cavity, the nasal mucosa will become congested, resulting in the inability to breathe normally through the nose, if the chronic inflammation is caused by the use of antibiotics such as cefixime, if it is caused by allergies, you can stay away from allergens, and if necessary, the use of drugs such as mometasone furoate treatment. 2. Enlarged adenoids: If the child has enlarged adenoids, it can also cause abnormalities in the respiratory tract, leading to open-mouth breathing and other symptoms, and when the condition is serious, it needs to be treated by surgical resection. 3. Tonsillar hypertrophy: If the tonsils are infected with pus, it will also lead to tonsillar hypertrophy, thus affecting the airway, leading to open-mouth breathing, at this time, you should use cefixime and other medications to reduce the enlargement of the tonsils, and if necessary, surgical treatment is also required. If the child does not know how to breathe through the nose, it is recommended to consult a doctor in a timely manner, improve the examination to clarify the cause of the disease, and carry out standardized treatment.