There are many reasons why babies have sticky nose, often occurring in the upper respiratory tract infection, sinusitis and other diseases. 1. Upper respiratory tract infection: it is the most common cause, mostly occurring in the case of low resistance after catching a cold or being wet in the rain, often manifested as fever, fatigue, runny nose, nasal congestion, etc. If combined with bacterial infections, the nasal mucus may be very sticky. In addition, if there are nasal polyps, deviated septum and other conditions, it is also very easy to combine with respiratory tract infections. 2. Sinusitis: it often occurs after upper respiratory tract infection or acute rhinitis, and the causative organisms are mostly purulent cocci, such as S. pneumoniae and S. staphylococcus, etc. The typical clinical manifestations are nasal congestion and nasal mucus. The typical clinical manifestations of nasal congestion, purulent nasal discharge, headache, cold, etc.. Babies with runny mucus nose may also be related to other causes, and should go to the hospital in time, under the guidance of the doctor for treatment.