A white hard substance inside the belly button of a newborn may be due to rubber band, scarring or umbilical infection, which can be closely observed and treated with anti-infection. 1. Rubber band: newborns need to tie the umbilical cord after birth, usually 7 to 10 days after birth will appear the natural fall off of the umbilical cord, therefore, see the white hard object may be tied the umbilical cord of the rubber band. Parents must be too worried, you can observe for a period of time, usually will fall off naturally. 2. Scar: newborns in the navel in the white hard object may be the umbilical cord stump after the shedding of the formation of the scar, in the process of healing the umbilical cord, formed by the proliferation of fibrous tissue, a shorter period of time when the color of the white, generally no special treatment, keep the navel clean and dry can be. 3. Umbilicitis: If you see a white hard substance in the newborn’s navel, when wiped with a cotton swab after the yellowish-white liquid can be seen, consider the incidence of umbilical cord inflammation, which may be accompanied by redness and swelling around the umbilicus, the parents can be disinfected with iodine twice a day, and if the symptoms do not improve, it is recommended that we consult a doctor in a timely manner, to be treated with anti-infective treatment, under the guidance of the doctor to use mupirocin ointment and so on.