Baby always runny nose for the following reasons: 1, respiratory tract infection, poor immunity of the baby repeated respiratory tract infection, can lead to the baby always runny nose, should give the baby more water, strengthen exercise to improve immunity and prevent infection; 2, sinusitis baby always runny nose, and the nose is mostly pus nasal mucus, should pay attention to sinusitis, it is recommended to the hospital to perform sinus CT examination to clarify the diagnosis, under the guidance of the doctor to give anti-infection 3, allergic rhinitis, generally clear nasal discharge, accompanied by nasal congestion and frequent sneezing and other symptoms, when contact with certain allergic substances, there will be frequent sneezing, runny nose, out of the allergic environment will be significantly relieved, should go to the hospital to perform allergen detection, avoid contact with allergens, anti-allergy treatment can be given; 4, baby cold reaction symptoms, appearing clear nasal discharge, by drinking more water and increase avoid getting cold, it can be relieved.