Three-month-old baby sneezing, runny nose if the symptoms are mild, the vast majority of children can be self-cured, but if the symptoms are more serious, there may be a risk of continued aggravation, should be timely to the hospital, the doctor will be based on the cause of the baby treatment. 1. Allergic rhinitis: Baby’s exposure to allergens may trigger an allergic reaction leading to allergic rhinitis, which often results in symptoms such as itchy nose, sneezing, runny nose and nasal congestion. Sea salt water nasal spray can be given to improve the symptoms. 2. Upper respiratory tract infections: If the baby’s body resistance drops, it may cause respiratory viral infections and lead to colds, often showing symptoms such as itchy nose, sneezing, runny nose, dry throat, sore throat, headache, fever and so on. If there is fever can be given to physical cooling treatment, but also can be added with sea salt water nasal spray, dilute nasal secretions, Pudilan anti-inflammatory oral solution and other drugs for treatment. If the baby’s symptoms are more serious, sneezing, runny nose, accompanied by depression or appetite significantly reduced, shortness of breath or breathing difficulties, be alert to the possibility of severe pneumonia, it is recommended to seek medical attention in a timely manner, due to the age of three-month-old babies, the condition of the rapid changes, may need to be hospitalized for treatment. If the baby sneezing, runny nose and other uncomfortable symptoms, or symptoms worsened, persistent unrelieved, please immediately seek medical attention, follow the doctor’s instructions for targeted treatment.