3.5 month old baby with runny nose, may be caused by cold, or may be infected, mostly caused by viral infection, can be given oral antiviral drugs, commonly used are antiviral oral liquid or ribavirin granules. At the same time the appropriate amount of infants to feed water, drink more water, if the course of the disease can have symptoms of improvement, there is no need to take other oral drugs, if there is no significant effect, can be combined with oral pediatric cold particles to treat. Because infants with runny nose will have the phenomenon of nasal mucous membrane secretion blockage, can be given with a warm wet towel placed near the nasal cavity, can effectively discharge the secretions in the nasal cavity, is conducive to alleviate the phenomenon of nasal mucous membrane blockage, but also conducive to the recovery of the disease.