4 and a half year old baby running yellow nose is common in the upper respiratory tract infection, sinusitis, etc., parents should take the baby to the hospital pediatrics in time, and under the guidance of the doctor for treatment, the treatment method includes general treatment, medication and so on. 1.general treatment: 4 years old baby yellow nasal discharge, the child should rest, light diet, increase the amount of water, and keep indoor air circulation, prevent cold. Can follow the doctor’s instructions to use saline nasal irrigation, improve the symptoms of nasal congestion, can also follow the doctor’s instructions to be suction care and other treatments. 2 to the cause of treatment: 4 and a half year old baby yellow nasal discharge, mostly due to gram-positive bacteria infection caused by upper respiratory tract infection and sinusitis, can improve nasopharyngoscopy, under the guidance of the doctor to the commonly used amoxicillin, cefuroxime and other drugs to control the infection, for the effect of the children, can improve the culture of the secretion, and according to the results of the drug susceptibility test to select sensitive antibiotics for treatment. For patients with fever, acetaminophen, ibuprofen and other drugs can be used as appropriate for antipyretic treatment. Parents of 4.5 year old babies with yellow nasal discharge should take them to the doctor to find out the cause of the disease and follow the doctor’s instructions for treatment, and should not use medication without authorization to avoid danger.