An outie belly button is primarily caused by how the scar from the umbilical cord stump heals after birth. When the umbilical stump falls off, the shape of the resulting scar determines whether the belly button is an innie (concave) or an outie (protruding). Most outies are simply a normal variation in how the skin and tissue heal, rather than being caused by how the umbilical cord was cut or clamped
. However, certain medical conditions can cause or contribute to an outie belly button:
- Umbilical hernia: A weakness in the abdominal muscles around the belly button allows part of the intestines to push out, causing the belly button to protrude. This is common in infants and may resolve on its own or require surgical repair
- Umbilical granuloma: Extra tissue growth around the umbilical stump can push the belly button outward. This condition is usually treated with topical medication
- **In adults, internal pressure from conditions such as pregnancy, ascites (fluid buildup in the abdomen), or enlargement of the liver and spleen (hepatosplenomegaly) can cause an innie belly button to become an outie temporarily
In summary, an outie belly button is mostly a natural variation caused by the way the umbilical scar heals, with some cases linked to medical conditions like umbilical hernias or granulomas. It is generally harmless and mostly a cosmetic difference
