More than 90% of colds are caused by viruses, with a small percentage caused by bacteria. One of the most common symptoms in babies is a runny nose, like a slug. When a cold causes acute rhinitis, the mucous membrane of the nasal cavity becomes congested and swollen, and the secretion of glands increases, resulting in nasal mucus. If there is no complication, the above symptoms will gradually decrease or even disappear, and the course of the disease is about 5-7 days. If there is a bacterial infection, the nasal discharge may become mucus, mucopurulent or purulent. The common cold is mostly a viral cold, usually with a clear runny nose, and there is no special medicine. Light symptoms can wait for self-cure. If there is more snot, you can use a wet and hot towel to put on the child’s nose, the nasal cavity will be more open. If your child has dry crusts in the nasal cavity, you can clean them with a cotton swab dipped in water or soak them in saline and remove the crusts when they become soft before applying medicine. When nasal congestion or runny nose affects your child’s sleep, you can cushion your head at 30° to relieve the symptoms. When an older child has a runny nose, let him blow it out. The correct way to blow the nose is to press firmly on one side of the nose and gently blow out the secretions from the opposite nasal cavity. Cold medicines for children are mostly compounded and are not recommended for children. If the runny nose continues for more than 10 days, more yellow-green nasal discharge, accompanied by fever, be alert to the complication of sinusitis, and choose antibiotics to control the infection under the guidance of the doctor to prevent it from turning chronic. Baby’s runny nose and nasal congestion, causing nasal inaccessibility and poor breathing, are the main reasons for baby’s crying and poor sleep. At present, self-medication is not recommended, and the rest can only be done from the baby’s daily life, diet, and strengthening nasal care.