It is normal for a baby’s belly button to be black. It is the dirt that appears after the skin in the navel is deposited. The navel inside the skin has folds, so it is easy to accumulate dirt, parents give the child a bath when the general dare not wash, so the accumulation of dirt slowly lead to this part of the skin black. In order to prevent this phenomenon, parents should do a good job of local skin disinfection and cleaning treatment, and every time you take a bath to clean the inside of the navel. As long as the usual appropriate cleaning, keep the local skin clean and dry, black belly button can also slowly return to normal. Baby belly button is black, there may be other reasons, if accompanied by other discomfort, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.