Many infants and young children after a cold, snot will continue to flow, so that parents and friends are very disturbed, cold and runny nose is mainly due to germs into the nasal cavity, caused by the nose of the secretion of the quality and quantity of changes, mostly acute rhinitis. In a healthy state, the nasal cavity is generally only a small amount of mucus, will not be random outflow, these mucus is not waste, there is the role of wetting the nasal mucosa. But if there is a cold, especially the infant body’s resistance is very weak, germs invade the nasal cavity caused by the reaction will be greater, so easy to appear snotty, has been flowing situation. Infant colds runny nose is generally caused by acute rhinitis, this time the nasal mucosa will be congested, will also be swollen, the glands will secrete more secretions, these secretions are out of the nose, if the cold is well, but also has been runny nose, it may be acute rhinitis into chronic, once turned into chronic rhinitis in the treatment will increase the difficulty. Babies with colds and runny noses need not be overly worried and nervous, parents and friends in the child wringing the nose, must be gentle and not too hard, so as not to damage the child’s skin.