The main point is to keep your child’s nasal cavity moist. The weather is dry in autumn and winter, you can give your child’s nasal cavity drops of paraffin oil, glycerin agent, you can also use a cotton swab dipped in gentamycin ointment or erythromycin eye ointment before going to bed and apply a thin layer in the nasal cavity, which can prevent the nasal mucosa from drying out. In addition, you can wash your child’s nose with light salt water or physiological seawater every day to keep the nasal cavity clean and moist.