Nosebleeds in 1 year old babies are not normal. Babies do not have nosebleeds under normal circumstances, and the common causes of nosebleeds in babies are: dry nasal mucosa, nasal lesions, blood system disorders and so on. 1. Dry nasal mucosa: an important cause of nosebleeds in babies. Due to the one-year-old baby nasal mucosa is more fragile, in contact with external stimulating substances or always digging the nostrils, it is easy to appear nasal mucosa erosion, damage, manifested as symptoms of nosebleed. 2. Nasal lesions: for example, allergic rhinitis, nasal septum deviation, etc., can also lead to the baby nosebleed, but also appear nose itching, nasal congestion and other symptoms. 3. Blood system diseases: for example, leukemia, thrombocytopenic purpura, etc., can lead to abnormal coagulation function, which in turn causes the baby nosebleed. In short, a year-old baby nosebleed this situation is not normal, if often nosebleed, it is recommended to go to the regular hospital in a timely manner to improve the blood routine, coagulation function, nasal endoscopy and other tests, which will help to determine the condition, to clarify the cause of the disease and targeted treatment.