How to properly handle a baby who constantly has a runny nose

Patient's question:

Age
Detailed medical condition and purpose of consultation: Runny nose
Duration of this illness: Three months to the present
Current general condition: Runny nose with dry mucus in the nose when warm, clear runny nose when cold.
Medical history: Had bronchitis at four months.

Doctor's answer:

Frequent colds are usually related to poor immunity. Pay attention to your diet, maintain a balanced nutrition, eat more fruits and vegetables, supplement sufficient vitamin C, and maintain good living habits. Persist in exercising to improve your physical fitness, thereby reducing the frequency of colds. When necessary, you can consider using some immune regulators under the guidance of a doctor for treatment.