One year old baby nosebleed considerations may be related to environmental factors, atrophic rhinitis, sinusitis and other factors. 1. environmental factors: because the environment is abnormally dry or dust, it may lead to nasal mucosa dry and damage, so that the nasal capillary rupture bleeding, so it will cause the baby nosebleed symptoms. 2. Atrophic rhinitis: refers to slowly occurring diffuse, progressive nasal atrophic lesions, may be related to nutritional conditions, living environment, autoimmune diseases and other factors. Clinical manifestations of nasal crusts, nasal congestion, loss of smell and other symptoms, nosebleed because of nasal dryness, as well as a large number of dry crusts attached, when the dry crusts fall off will easily cause nasal bleeding. 3. Sinusitis: mostly caused by upper respiratory tract infection or acute rhinitis, clinical manifestations of nasal congestion, pus flow, headache and other symptoms. Nosebleed is because the inflammatory secretions in the nasal cavity for the formation of nasal mucous membrane stimulation, causing nasal mucous membrane dryness, erosion, etc., it is easy to cause bleeding. Nosebleeds in one year old babies may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.