Nosebleeds in babies are commonly caused by the following reasons: 1. Dry environmental air and little water on weekdays, resulting in dry nasal cavity. You can use vitamin D drops in the nostrils because they are oily and can keep the nasal mucosa moist for a long time. 2. congenital nasal septum distortion, frequent nosebleeds on weekdays, you can go to the ENT department for CT examination to clarify, if necessary, surgical treatment. 3. hematological system disorders. In addition to nosebleeds, frequent bruises on the body on weekdays, or wounds that take a long time to stop bleeding, pay attention to hematological system disorders, and if necessary, undergo bone puncture examination.