Infant runny nose may be caused by cold air stimulation and other physiological reasons, but also may be caused by diseases, such as colds or allergic rhinitis, etc., according to the condition of the choice of general treatment, medication and other methods to relieve. 1. Physiological reasons: infants with runny noses may be caused by cold air stimulation and other physiological reasons, parents should let the baby drink more warm water, add appropriate clothing, and maintain indoor air circulation. 2. Colds: Infants’ runny noses may also be caused by colds, which can be treated with medicines such as pediatric cold granules. 3. Allergic rhinitis: If it is caused by allergic rhinitis, you can check the allergens, and when the allergens are clear, you can avoid contact with the allergens to relieve the symptoms. Infants may also have other reasons for running nose, the above drugs should be used under the guidance of the doctor, avoid self-medication. If the symptoms of runny nose in infants continue to be unrelieved, they should consult a doctor.