One year old nine months baby blood routine are normal, nosebleed considerations with the weather factors, but also may be often picking the nose, rhinitis and other factors triggered. 1. Weather factors, if the weather is dry, the nasal mucosa after drying may lead to capillary rupture, so there will be symptoms of nosebleeds. 2. Frequent nose picking, if the baby often like picking the nose may lead to the baby’s capillary damage rupture, so this symptom will appear. 3. Rhinitis, if there has been a rhinitis, nasal inflammation stimulation of the nasal cavity, may lead to the emergence of such symptoms. One year old nine months baby blood routine are normal, nosebleeds may have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.