There is no fastest treatment for babies with runny nose and sneezing, it may be caused by cold or allergic rhinitis, which can be treated with general treatment or medication. 1. Colds, some infants with runny noses and sneezes may have colds, you can give more warm water to infants and do a good job of keeping the body warm. If the situation is more serious, you can use pediatric cold granules and other drugs under the guidance of the doctor. 2. Allergic rhinitis, if the baby has allergic rhinitis, contact with allergic substances may produce this symptom, need to stay away from allergens, if necessary, under the guidance of the doctor can use antihistamines. Normally, you need to observe your baby more often to avoid the recurrence of the disease.