Physiological seawater nasal spray is available for use on infants and is a treatment often used in clinical work mainly for clearing up thicker secretions in the nasal cavity or when there are more dry crusts attached to the front of the nose. Because the liquid inside is physiological saline, it does not cause damage to the environment of the nasal cavity. While clearing the dried crust of nasal secretions, it can also promote the recovery of nasal mucosal function and promote the ventilation and drainage of the nasal cavity and sinuses. However, if there is yellow discharge, the effect of using nasal spray alone may not be particularly good, which may be caused by bacterial infection, it is best to take allergy antibiotics at the same time. Since the maxillary sinus is the first to develop in infants and children, if the inflammatory infection is particularly severe, it can cause recurrent fever and even lead to developmental deformities, so early and thorough treatment is recommended.