Nosebleeds are not a normal phenomenon in 3 year old babies, and once they occur, there must be some reason for them. 3 year old babies with nosebleeds are most commonly caused by dry air in the room leading to dry nasal mucosa, resulting in increased vascular fragility and bleeding, which can be prevented by humidifying the air. 3 year old babies with nosebleeds may also be related to the lack of vitamin C, fire, etc., and can be corrected by supplementing vitamin C, giving the child water, diet, etc. 3 year old babies with frequent nosebleeds should consider the following diseases: 1. C, give the child more water, eat a light diet can be well corrected. 3-year-old baby if often nosebleed to consider the following diseases: 1, the immune system is relatively low, often colds, infections, etc., can lead to bacterial growth in the nasal cavity caused by the phenomenon of nosebleeds; 2, it may be a disease of the blood system caused by the phenomenon of nosebleeds, we should promptly conduct blood tests to see if there is no reduction in platelets, coagulation function there are no problems, etc., once identified should be prompt Once identified, it should be treated in time. 3. Localized lesions in the nose, otorhinolaryngology specialist outpatient clinic