Why do we have belly buttons?

Why do we have belly buttons?

Every placental mammal possesses a belly button because of the unique way they develop in the womb. During pregnancy, the fetus cannot eat or breathe on its own, so it relies entirely on the umbilical cord. This tube connects the fetal circulatory system to the placenta, which acts as a filter and exchange site for the mother’s blood. The cord contains two arteries and one vein, protected by a substance called Wharton’s jelly.

When a baby is born, the umbilical cord is no longer necessary because the infant’s lungs and digestive system begin to function. A doctor or midwife clamps the cord and cuts it, leaving a small stump on the infant's abdomen. Within one to three weeks, this stump dries up, turns black, and eventually falls off naturally. The remaining tissue heals into the indentation we recognize as the navel, serving as a permanent anatomical reminder of our prenatal development.

How does the umbilical cord function?

The umbilical cord is a sophisticated biological conduit that ensures the survival of the fetus. It functions as a bridge, transporting oxygenated, nutrient-rich blood from the placenta to the fetus, while simultaneously carrying waste products like carbon dioxide and urea back to the placenta to be processed by the mother’s body. Without this connection, the rapid growth and development required during the nine months of gestation would be impossible.

The structure of the cord is remarkably resilient, designed to prevent kinking or compression that could restrict blood flow. It is composed of:

• Two umbilical arteries that carry deoxygenated blood away from the fetus.
• One umbilical vein that carries oxygenated, nutrient-rich blood toward the fetus.
• Wharton’s jelly, a gelatinous substance that cushions the vessels and prevents them from collapsing.
• An outer layer of amniotic membrane that protects the entire structure from the surrounding amniotic fluid.

What are the different types of belly buttons?

While all belly buttons originate from the same process, they vary significantly in appearance due to how the abdominal wall heals after the cord stump falls off. There is no genetic blueprint for a specific shape; rather, the final look is determined by the way the skin contracts and the underlying muscle tissue settles. Most people have an "innie," where the skin pulls inward, but some have an "outie," where the tissue protrudes outward.

An "outie" is often the result of a minor umbilical hernia, which occurs when a small portion of the intestine pushes through the abdominal wall before it has fully closed. In many cases, these resolve on their own during early childhood as the abdominal muscles strengthen. If an outie persists into adulthood, it is simply a variation of normal human anatomy and does not indicate a health problem. The shape of your navel is essentially a unique signature of your body’s healing process during infancy.

How to clean your belly button safely

Because the navel is a deep, often moist cavity, it can become a breeding ground for bacteria, yeast, and dead skin cells if not cleaned regularly. Many people overlook this area during their daily shower routine, which can lead to unpleasant odors or minor infections. To maintain proper hygiene, you should gently clean the area at least once or twice a week.

Follow these steps to ensure you are cleaning the area correctly:

1. Use a mild soap and warm water on a soft washcloth to gently wipe the interior of the navel.
2. If your navel is particularly deep, use a cotton swab dipped in a mixture of water and gentle soap to reach the crevices.
3. Rinse the area thoroughly with clean water to ensure no soap residue remains, as this can cause irritation.
4. Dry the area completely with a clean towel, as moisture trapped in the folds can encourage fungal growth.

Common mistakes when caring for your navel

One of the most frequent mistakes people make is neglecting the belly button entirely, which allows debris—a mixture of lint, sweat, and skin cells—to accumulate. This buildup, often called "navel fluff," is harmless but can become quite dirty if left for months. Conversely, some people scrub the area too aggressively with harsh chemicals or abrasive tools, which can cause micro-tears in the delicate skin and lead to inflammation or infection.

Avoid these common pitfalls to keep your navel healthy:

• Do not use sharp objects or fingernails to dig out debris, as the skin inside the navel is thin and easily damaged.
• Avoid applying heavy lotions or oils inside the navel, as these can trap moisture and promote bacterial overgrowth.
• Do not ignore persistent redness, swelling, or discharge, as these can be signs of an infection that requires medical attention.
• Avoid using scented soaps or harsh antiseptics that may disrupt the natural microbiome of the skin, potentially leading to irritation or dermatitis.