The nasal runny nose of babies is usually divided into two kinds: normal nasal runny nose and abnormal nasal runny nose. The nasal runny nose caused by environmental stimulation usually does not need special treatment, while some abnormal nasal runny nose is mostly caused by respiratory diseases and should be treated promptly. Normal nasal discharge: the color is colorless and transparent, and it usually does not flow out in the baby’s nasal cavity. This kind of runny nose is mostly caused by the baby crying or stimulated by cold air, but the symptoms of runny nose will disappear soon. Abnormal runny nose: If the nose is clear, it is mostly caused by the early stage of the cold and the amount of runny nose is large. Bacterial colds usually have a yellowish-green nasal discharge, and the body may experience fever and headache. Allergic rhinitis can also cause a runny nose with sneezing and an itchy nose. Sinusitis can lead to yellow-green nasal discharge in babies, accompanied by headache, fever and nausea, etc. When these symptoms occur, they should be treated in hospital. Usually a runny nose in babies is caused by the above two reasons. If the symptoms of runny nose are relatively mild, it is recommended to strengthen life care, and take medication in time when the condition is serious.