Three months baby cough throat phlegm may be upper respiratory tract infection, tonsillitis, bronchitis and other diseases caused by the need to comply with the medical advice of medication, general measures and so on. 1. Upper respiratory tract infection: children often cough, runny nose, sneezing, nasal congestion and other symptoms, can also be manifested as coughing throat with phlegm. The use of expectorant drugs such as Ambroxol and Bromhexine is required under the guidance of a doctor. 2. Tonsillitis: children often have fever, sore throat and other symptoms, some patients may also be accompanied by coughing throat with phlegm and other symptoms. Generally viral infection caused by tonsillitis, no medication, while bacterial infection caused by the need to follow the doctor’s instructions to use antibiotics such as amoxicillin treatment, so as to alleviate the symptoms. At the same time, parents need to pay attention to the child’s diet, appropriate nutrition, drink more water. 3. Bronchitis: Children with cough and phlegm in the throat need to be treated with aminoglutethimide hydrochloride and other phlegmatic drugs as prescribed by the doctor. The above drugs are not allowed to be used by those who are allergic to them. It is recommended that when a three-month-old baby has a cough with phlegm in the throat and the symptoms are severe, he or she should actively seek medical treatment.