Clinical does not have the easiest way to say what to do when an infant has a runny nose, when an infant has a runny nose, parents should just wipe it off in time with a special tissue. Infants commonly run clear water nose cause of cold air stimulation and cold. 1. Cold air stimulation: babies are born with low immunity and are susceptible to external cold air stimulation and the phenomenon of runny nose, which is a normal situation. Usually, parents can use special tissues for infants to wipe their noses when they find that infants have clear nasal discharge, thus improving the comfort of infants and also reducing the stimulation or influence of nasal discharge on local skin and mucous membranes. 2. Colds: Some infants have clear nasal discharge because of colds, which are easily accompanied by other symptoms such as crying, loss of appetite and elevated body temperature. Since colds are self-limiting, parents do not need to take special measures to deal with them, and can strengthen the care of infants in the near future. There are many other causes of runny nose in infants, such as allergic rhinitis and spicy food intake. Parents should take their infants to the doctor as soon as possible if they have other symptoms.