Nosebleeds in babies can be ruled out as leukemia by observing the baby’s symptoms, the duration of the bleed, and completing laboratory tests. Under normal circumstances, nosebleeds in babies are easier to stop and are less likely to recur. On the other hand, patients with leukemia will bleed from the mucous membranes of the skin, mouth, gums and other parts of the body, in addition to bleeding for a longer period of time. Patients with leukemia bleed for a longer period of time than ordinary diseases that cause bleeding, and are prone to recurrence. Patients suspected of leukemia can be clearly diagnosed by perfecting blood routine, coagulation function test and bone marrow puncture. Through the examination, the patient’s platelets, white blood cells, lymphocytes but with abnormal values can be found. At the same time the clotting time is prolonged. Baby nosebleed for a long time does not relieve, it is recommended to consult a doctor in time to clarify the diagnosis, to carry out targeted treatment, to avoid delaying the time of treatment.