Belly button bleeding water is often caused by the following reasons: 1, umbilical infection, which is commonly known as umbilical infection, when there is a local infection can appear to have obvious bleeding water, at the same time will be combined with redness and swelling, and there will be obvious pain. The doctor will make an incision under local anesthesia to remove the infected necrotic tissue, and then change the medication regularly. It is also necessary to take oral antibiotics for treatment and try not to get the wound wet during treatment. 2. It may be caused by an infection of the umbilical ureter, which is a congenital disease caused by a tube between the umbilicus and the bladder that is not closed. You need to go to the urology department or general surgery department of the hospital for examination, and you need to check the routine blood or abdominal CT, and ultrasound and other examinations. If the disease is clearly identified, surgery is required to prevent malignant changes.