The umbilical cord is dry. It's old.

The umbilical cord will fall off automatically within 3 to 7 days. If the umbilical cord does not fall off for a long time, it may be related to the thicker umbilical cord. You can go to the hospital for treatment. Usually pay attention to keeping the umbilical cord clean and dry, disinfect it regularly with ethanol solution or iodophor, and change the baby's diapers in time to prevent contamination of the umbilical cord.