A 4-year-old child with a cough with phlegm can be treated symptomatically, in addition to the need to identify the cause of the disease, targeted treatment, such as the administration of phlegm drugs, anti-inflammatory drugs and dietary adjustments, the drug should be used under the guidance of a doctor. A 4-year-old child with a cough and phlegm can be treated symptomatically, such as the use of ambroxol or acetylcysteine. Acetylcysteine solution nebulization use phlegm better. Usually pay attention to the baby’s back patting to promote the discharge of phlegm. In addition, timely consultation is needed to clarify the cause of the disease, and targeted treatment is needed according to the cause. If there is a bacterial infection, you can use cephalosporin or penicillin antibiotics, if the mycoplasma infection, you can use azithromycin and other macrolide drugs. In daily life, parents need to pay attention to give children a light diet and drink more warm boiled water. Avoid spicy, stimulating and greasy food. If the symptoms are not relieved for a long time, it is recommended to consult a doctor in time to make a clear diagnosis and then carry out targeted treatment. Medications should be used under the guidance of a doctor.