A 3 and a half year old baby always has nosebleeds, which may be related to nasal dryness, blood system diseases, deviated nasal septum, etc., and need to be treated symptomatically. 1. Nasal dryness: 3 and a half year old baby’s respiratory tract is not yet fully developed, the nasal mucosa is thin, the risk of nosebleed is high. When sleeping at night, the child is used to lie on his back or used to touch the dry nasal cavity with his hands, it is easy to have nosebleeds. You can moisten the baby’s nasal cavity, if necessary, use a humidifier to control the indoor humidity uniform appropriate range. 2. Blood system diseases: when the baby suffers from idiopathic thrombocytopenic purpura and other blood system diseases, due to the platelet function is reduced or the number of reduced, may appear in the middle of the night nosebleeds and other situations, need to consult a doctor in time, under the guidance of the doctor to use immunosuppressive drugs and other drugs for treatment. 3. Nasal septum deviation: when the baby exists in the nasal septum deviation and other structural abnormalities, may also lead to the occurrence of nosebleeds, if it is not serious, can be through the local pressure, nasal filling gelatin sponge to achieve the purpose of stopping bleeding. If the bleeding is more serious, you need to seek medical treatment such as plasma coagulation. Therefore, 3 years old baby is always in the middle of the night nosebleed more reasons, it is recommended to timely medical treatment, combined with the results of comprehensive judgment, and then take the appropriate means of treatment. Usually pay attention to a light diet, maintain good habits and the air appropriate humidity, can reduce the occurrence of nosebleeds.