Infant navel yellow water causes are mainly considered umbilical cord inflammation, umbilical intestinal fistula, umbilical urethral fistula and other diseases. 1. Umbilical cord infection: the majority of babies occurring in the newborn or about three months after birth, the symptoms are mainly pus and red swelling of the navel, can be sterilized with iodine vodka, erythromycin ointment coated with treatment therapy. 2. Umbilical intestinal fistula: mainly due to congenital developmental factors, resulting in the umbilical intestinal tube is not closed caused by the discharge of stool from the umbilical cord, resulting in the phenomenon of yellow water. Can be diagnosed by ultrasound and other tests, need surgery to repair the treatment. 3. Umbilical urethral fistula: is due to the umbilical urethra between the top of the bladder and the navel and not atresia, will lead to urine discharged from the navel mouth, the formation of the phenomenon of yellow water, need surgery to restore. Infants with yellow water flowing from the navel, need to consult a doctor in time, according to the extent of the disease to choose the appropriate examination and treatment, to avoid delaying the condition.