Belly button is stinky common in the following cases: first, umbilical cord inflammation, navel long-term not cleaning will lead to the accumulation of things, it will lead to infection and become stinky, sometimes also because of improper cleaning lead to skin damage infection, can be cleaned up after the dirt, the local intermittent rubbing iodine vodka or Baiduobang and other medicines to treat, but if the redness is serious, or even obvious oozing, you need to go to the hospital in time to deal with surgical treatment, clearing the wound if necessary, and then antibiotics. Later on, antibiotics will be used for treatment. Second, umbilical ureteric cyst, is a congenital developmental abnormality of the disease, in the embryonic period, the umbilicus and the bladder have a channel communication, but in the birth of the tube will be atresia, if not atresia, there will be urine continued in the umbilicus under the skin accumulation, and ultimately caused by infections, need to go to the hospital after the relevant examination and surgical treatment. In conclusion, if there is persistent abnormality at the umbilicus, it is necessary to go to the hospital in time.