A yellow runny nose in babies indicates a possible respiratory infection. A yellow runny nose is one of the symptoms of a respiratory infection, which is usually relieved by drinking more water or using physiological sea salt water to clean the nasal cavity. The child’s nasal discharge may be clear and mucous, and the color may be white, yellow or green, etc. In the early stage of respiratory infection, it is often clear and white, and slowly becomes mucous during the course of the disease, and if there is yellow-green nasal discharge, it often indicates the possibility of local bacterial infection. If the child has allergy-related diseases, he or she will also tend to have a runny nose, which may be combined with sneezing and nasal itching. In terms of treatment, if the runny nose is caused by respiratory tract infection, it usually does not require special treatment. In daily life, it is necessary to drink more water and wash the nasal cavity with physiological sea salt water, and it is generally not recommended to use cold medicine or proprietary Chinese medicine.