A protruding belly button in a newborn is not normal. A newborn with a protruding belly button is more likely to have an umbilical hernia. The abdominal wall of the newborn period is relatively weak, when the newborn appeared to cry, sneeze, runny nose and other increased abdominal pressure, can lead to the occurrence of umbilical hernia, umbilical hernia is due to the development of the abdominal wall of the newborn abnormalities, part of the intestinal tube protrudes from the cause. The umbilical hernia is caused by abnormalities in the development of the abdominal wall, part of the intestinal tube protrudes. If the umbilical protrusion of the newborn baby is incarcerated and stuck, it may lead to localized ischemic necrosis of the omentum or intestinal tubes, resulting in intestinal obstruction, or a serious abdominal cavity infection, resulting in peritonitis. If the newborn’s belly button is severe or has not been improved, it is recommended to go to the hospital in time to deal with.