Infants sleeping with their mouths open are mainly seen in the following clinical situations, each of which is treated as follows: 1. nasal blockage caused by acute and chronic rhinitis, which induces infants to sleep with their mouths open, is mostly seen clinically after upper respiratory tract infections, and can be treated with saline drops or nasal spray with physiological seawater to reduce the swelling of the nasal mucosa, thus relieving the symptoms of nasal congestion. 2. infants with adenoids If the adenoids are not particularly large, clinically it is still conservative, if the adenoids completely block the posterior nostrils, clinically it is also appropriate to consider surgical removal of adenoids. 3, infants have bilateral tonsillar hypertrophy, after tonsillar hypertrophy The main purpose of the surgery is to control the inflammatory stimulation of the tonsils, reduce the inflammation of the tonsils, and reduce the recurring hyperplasia and hypertrophy of the tonsils, which can be done when the baby is older.