Five months baby runny nose may be cold, allergic rhinitis and other diseases, need to take general measures, medication for treatment. 1. Colds: common symptoms are nasal congestion, runny nose, etc., children need to pay attention to nasal hygiene, mostly due to viral infections, generally no specific antiviral drugs, so the symptomatic treatment is based on the use of saline nasal spray under the guidance of a doctor, phlegm suction care and other symptomatic supportive treatment. 2. Allergic rhinitis: Typical symptoms are watery nasal discharge and itchy nose. Children need to stay away from allergens and parents need to keep the indoor environment dry and clean. Can also be given sea salt water nasal spray, wash out allergens, improve allergy symptoms. There may be a lot more to a five-month-old baby’s runny nose, when a five-month-old baby runny nose need to strengthen the management of daily life, and timely access to hospitals, improve the blood routine and other tests, can be prescribed by the doctor to be targeted treatment.