Generally after 6 months of pregnancy, the fetus gradually grows, the uterus increases, the pressure in the uterine cavity, can appear belly button protrusion phenomenon, but there can be differences between different individuals. Belly button protrusion is mainly related to the skin tightness and body type of pregnant women, if the skin is tighter, the muscle is fuller, tension is sufficient, not subject to external pressure, not easy to appear belly button protrusion; such as the skin is more relaxed, tension is smaller women, the case of belly button protrusion is relatively more. Body type thin women belly button protrusion is more obvious, body type fat is generally appear belly button protrusion time later or not protrude. Belly button protrusion generally does not affect the health of pregnant women and fetuses, if there are no other uncomfortable symptoms, usually do not need special treatment. Usually you need to pay attention to rest, avoid strenuous exercise, relax and keep your belly button clean and hygienic.