A protruding belly button during pregnancy is a normal physiological phenomenon. The belly button protrudes out during pregnancy because when pregnant women are pregnant, the abdominal pressure will gradually increase and the whole abdomen will be compressed, so the belly button may protrude out. When pregnant, due to the gradual increase in the gestational age of the fetus, the uterus will also become larger and larger, so the pressure in the abdominal cavity constantly make the abdomen under pressure, and the skin around the navel is relatively thin compared to other parts of the body, so it is easier to protrude outward. Therefore, if you find the belly button protruding during pregnancy is a normal physiological phenomenon, do not need to be overly nervous and worried, usually pay more attention to the good maternity examination, maintain a good state of mind and mood, and properly do some exercise.