The formation of the belly button is after the birth of the fetus, the baby and the mother connected to the umbilical cord will be cut, to be cut off the umbilical cord on the baby’s body after the wound scabs fall off, the formation of traces is the belly button. The role of the navel in the fetal period is very much, can play a role in the transportation of nutrients, can be transported through the navel of the mother’s body nutrients to the fetus, can promote better growth and development of the fetus, but also can play a role in the side circulation, when the adult body has some kind of disease, if the body pressure is too large can be through the navel to the side circulation. Navel in the human body plays a very important role, if when our navel infection, should immediately consult a doctor, under the guidance of the doctor to cooperate with the treatment, usually pay attention to local hygiene, keep the skin dry to prevent infection.