A child with a cold and fever, cough and yellow nasal discharge for 6 days, may be respiratory tract bacterial infection, mycoplasma infection, viral infection and other causes, you can use cephalosporin and other antibiotic drugs, immunomodulators and other treatments. 1. bacterial infection: bacterial infection is the most direct and effective use of antibiotics, for children, should use antibiotics with fewer side effects, such as cephalosporin, penicillin and so on. 2. Mycoplasma infections: at this time, you should use effective drugs for mycoplasma infections, such as azithromycin, etc. for treatment. 3. viral infection: at this time generally do not use antibiotics, but the use of immunomodulatory drugs, such as interferon, etc., to improve the body’s immunity, so as to reduce the symptoms. If a child has a cold and fever, cough, yellow snot symptoms continue to be unable to relieve, you should go to the hospital in a timely manner, under the guidance of the doctor for standardized treatment. The use of medication in accordance with medical advice, avoid unauthorized use of medication.