Colds generally refer to upper respiratory tract infections, children with upper respiratory tract infections, runny yellow and green nose is mainly due to bacterial infection. Upper respiratory tract infection is a general term for acute inflammation of the nasal cavity, pharynx or larynx, with acute nasopharyngitis as the main cause. Its causes include pathogen infection, rain, sudden changes in climate, excessive fatigue, anemia and so on. When a child’s upper respiratory tract infection appears to flow yellow and green nasal discharge, it is mostly considered to be caused by bacterial infection. Patients may also be accompanied by cough, sore throat, hoarseness, dulled sense of taste, dyspnea, fever and other symptoms. For bacterial infections, oral antibiotics, such as amoxicillin, can be prescribed, and if there is a lot of nasal discharge, patients can also take oral antihistamines, such as cetirizine, as prescribed. Once diagnosed with upper respiratory tract infection, parents need to bring their children to the regular hospital, and need to actively cooperate with the doctor to take relevant treatment measures, so as not to delay the condition. In daily life, we need to keep the indoor air smooth, pay attention to warm measures.