Phlegm sound in baby’s sleep breathing is usually caused by gastroesophageal reflux, congenital laryngeal chondromalacia, respiratory infectious diseases, etc. It can be treated by eating less and more food, calcium supplementation, and Ambroxol Hydrochloride Oral Liquid. 1. Gastroesophageal reflux: it is mostly seen in some chubby children who eat a lot of milk. Because the baby’s gastrointestinal tract is not well developed, the cardia is more flaccid, which can easily cause esophageal reflux and lead to snoring when sleeping, and eating less and more meals can alleviate the symptoms. 2. congenital laryngeal chondromalacia: if the baby is congenital laryngeal chondromalacia, may also appear phlegm sound during sleep, even choking, paroxysmal wheezing and so on when drinking milk, need to give calcium oral liquid and other calcium supplements in time to be corrected. 3. Respiratory infections: such as bronchitis, can be coupled with cough medication, such as ambroxol hydrochloride oral solution or acetylcysteine particles, etc., bacterial infections also need to take oral anti-infective drugs, such as cefdinir and so on. Because there are more reasons for babies to sleep and breathe with phlegm sound, it is recommended that parents should take their babies to the hospital in time, and take the corresponding medication under the guidance of professional doctors. In addition, let the child sleep on his side helps to relieve the blockage caused by phlegm.