Cold is also known as upper respiratory tract infection, mostly caused by viral infection, self-limiting, symptomatic treatment can be, the general natural course of the cold about 7-10 days. If your baby still has a runny nose after a week of cold, first of all, you can use a hot towel on the root of the bridge of your baby’s nose, and you can also use physiological seawater to rinse the nasal cavity, which can help to reduce nasal congestion, reduce nasal secretions and relieve your baby’s runny nose. If these measures are still not effective, you need to pay attention to the possibility of combined allergic rhinitis in your baby. Your baby may sneeze, especially after cold air stimulation. You can give your baby oral anti-allergy medication, such as Desloratadine dry suspension, Cetirizine drops, etc.