Infants with runny nose usually heal themselves in a few days, which is mainly related to the severity of the disease, personal constitution and other factors, and cannot be generalized. If it is a common viral cold, the symptoms are generally mild and the child is still in good spirits. By strengthening daily care, paying attention to warmth and drinking an appropriate amount of water, the cold can usually heal itself in 5-7 days without special treatment and can be closely observed. If the symptoms of the cold are heavy, prolonged and accompanied by other symptoms, such as cough, nasal congestion, crying, etc., it is generally not recommended to wait for self-healing, it is recommended to promptly go to the regular hospital pediatric internal medicine, clear diagnosis and follow the doctor’s instructions for targeted treatment. In daily life, the child should have a light and easy-to-digest diet, keep the living environment ventilated and hygienic, and try not to go to crowded public places.