Colds, also known as acute upper respiratory tract infections, are caused by viral infections and are self-limiting, with a duration of about 7-10 days. Even if you take oral cold medicine, it will not shorten the duration of the illness, and colds are usually most severe in about 2-3 days, so even if you take cold medicine, there may be no significant reduction in symptoms. Therefore, if a cold is identified, take rest and drink an appropriate amount of water. If fever is present, symptomatic treatment such as antipyretic can be given. If the baby still has a high fever, depression, or even vomiting after 3 days in addition to fever, runny nose, sneezing, watery eyes, etc., the baby may develop lower respiratory tract infection or other diseases, and need to go to the hospital for medical treatment in time.