The child is 4 years old coughing with phlegm for two months is not good, there may be chronic bronchitis, chronic pharyngitis or allergies, etc., can be improved by improving immunity, away from allergens, adjusting lifestyle habits or the use of medication, etc. to treat. 1. Chronic bronchitis: a 4-year-old child coughing up phlegm for two months is not good, usually due to the child’s low immunity caused by chronic bronchitis. The child can through regular exercise, balanced diet to improve immunity, but also the use of drugs, such as amoxicillin, cefixime capsules and other drugs for treatment. 2. chronic pharyngitis: the child 4 years old cough phlegm two months not good may also be pharyngitis caused by throat discomfort caused. Attention to identify the causes of chronic pharyngitis, improve the living environment (avoid dust and harmful gases), active treatment of chronic inflammation of the nose and nasopharynx, gastroesophageal reflux to take acid-suppressing preparations. 3. Allergy: pediatric cough may also be due to inhalation of allergy-prone gases and other causes, first of all, to detect the allergens, away from the allergens, and then drink more water in moderation, light diet, and if necessary, the use of anti-allergy drugs, such as cetirizine hydrochloride tablets and other treatments. Parents once found the child 4 years old cough phlegm two months is not good, it is recommended to take the child to the doctor in a timely manner after standardized treatment. In addition, if you need to use drugs should be used under the guidance of a doctor, do not blindly use drugs.