The Surprising Truth Behind Why Some People Have Outie Belly Buttons

Health Points

• Outie belly buttons form from how scar tissue heals after the umbilical cord falls off, not from how doctors cut the cord
• Only about 10% of people have outie belly buttons, with most developing innies naturally during healing
• While outies are typically harmless, sudden changes in belly button appearance may signal umbilical hernias requiring medical attention

For those who’ve ever wondered why belly buttons come in different shapes, the answer lies in a surprisingly simple biological process that has nothing to do with medical technique. The distinction between innies and outies is determined by how your body healed after birth, not by the way your umbilical cord was cut or clamped.

According to medical experts, this common misconception has persisted for generations. The truth is far more fascinating and rooted in the natural healing process that occurs in every newborn.

When babies are born, the umbilical cord is clamped and cut, leaving a small stump attached to the abdomen. Within one to three weeks, this stump naturally dries up and falls off, revealing the belly button underneath. The final appearance depends entirely on how the scar tissue forms during this healing period.

Dr. Kimberly Langdon, an OB-GYN with over 20 years of experience, explains that the process is entirely natural. The way collagen deposits form and contract as the wound heals determines whether someone develops an innie or outie.

“The belly button is simply scar tissue from where the umbilical cord was attached,” medical professionals note. “How that scar tissue heals is what creates the final shape.”

Statistics show that outies are relatively uncommon, affecting only about 10% of the population. The vast majority of people develop innies as their umbilical stumps heal and the skin naturally folds inward.

For parents of newborns, there’s no way to predict or control which type their baby will have. Folk remedies like taping coins over the belly button or binding the area have no scientific basis and could potentially cause harm or infection.

While most outies are completely harmless variations in normal anatomy, certain medical conditions can cause or contribute to their formation. Umbilical hernias, which occur when abdominal tissue pushes through a weakness in the muscle wall near the belly button, are one such condition.

In infants, small umbilical hernias often close on their own by age 1 or 2 without intervention. Larger hernias or those persisting beyond early childhood may require surgical repair to prevent complications.

Adults should be aware that sudden changes in belly button appearance warrant medical evaluation. A previously flat or innie belly button that suddenly protrudes could indicate an umbilical hernia, especially if accompanied by pain, tenderness, or a visible bulge that increases with coughing or straining.

Pregnancy commonly causes temporary changes to the belly button as the growing uterus stretches the abdominal wall. Many women find their innies become outies during the third trimester, though this typically reverses after delivery.

Dr. Langdon emphasizes that expectant mothers shouldn’t be concerned about these normal changes. “The stretching of the abdominal muscles and skin during pregnancy can push the belly button outward, but this is completely normal and usually resolves postpartum,” she notes.

Beyond hernias, other factors can influence belly button appearance over a lifetime. Significant weight gain or loss, abdominal surgeries, and natural aging processes can all alter the shape and depth of the navel.

For individuals bothered by the appearance of an outie, cosmetic surgery options exist. Umbilicoplasty is a procedure that can reshape the belly button, though it’s considered elective and typically not covered by insurance.

Medical experts stress that outies require no special care beyond normal hygiene practices. Both innies and outies should be cleaned regularly with soap and water, paying attention to remove any accumulated debris or lint.

The key takeaway for health-conscious individuals is that belly button type is simply a normal variation in human anatomy. Unless accompanied by pain, discharge, or sudden changes, an outie belly button is nothing to worry about—just another example of the beautiful diversity in how our bodies heal and develop.

Parents, expectant mothers, and anyone with concerns about their belly button should consult with their healthcare provider. While most variations are completely benign, professional evaluation can provide peace of mind and catch any underlying issues that may need attention.