When a baby has a runny nose, mom and dad think: Is it a cold? What medicine should I take? In fact, there are many different kinds of runny noses in babies. 1.Rhinitis caused by cold is called acute rhinitis, at this time the mucous membrane of nasal cavity is congested and swollen, and the secretion of glands increases, that is to say, nasal mucus is formed, which is clear water-like at first, and gradually becomes pus after 3 to 5 days, and then gradually heals. 2, often runny nose and accompanied by nasal congestion, nasal itching, sneezing and other symptoms, especially early in the morning after waking up obvious, from the warm nest, immediately sneezing, followed by clear water nasal flow, need to be alert to whether the baby is suffering from allergic rhinitis. 3, if the baby’s side of the nasal cavity has a foul smell, runny nose, sometimes with blood in the snot, you need to consider whether there is a foreign body in the nasal cavity. This happens mostly in children around 3 years old, playing because of curiosity, often put paper, beans and other foreign objects into the nasal cavity, plugged in and can not take out and produce odor, but metal parts, small buttons into the nasal cavity does not necessarily cause odor. 4, baby due to acute and chronic rhinitis secondary to sinusitis, often a lot of nasal mucus, seemingly “endless flow”, sometimes accompanied by headache. 5, individual baby only unilateral nasal discharge, but blowing can not blow out, nostrils are not ventilated, sleep snoring, then be alert to the presence of nasal polyps.