We have belly buttons because they are the scar left behind after the umbilical cord is cut at birth.

Before birth, the umbilical cord connects a developing fetus to the placenta. Through this cord, oxygen, nutrients, and waste products are exchanged between the mother and the fetus. After birth, the cord is no longer needed and is clamped and cut. When the remaining stump dries and falls off, it leaves a small scar on the abdomen - what we commonly call the belly button, or navel.

In short: the belly button is not a functional body part - it is a healed scar from fetal development.

This question trends globally for a few recurring reasons:

  • Educational curiosity: Students and parents frequently search basic human biology topics.
  • Social media prompts: Simple “why does the body do this?” questions often go viral.
  • Pregnancy and parenting discussions: Expecting parents often want to understand fetal development.
  • Medical curiosity: People notice differences in belly button shapes (innie vs. outie) and want explanations.

This is not driven by new medical discoveries. It resurfaces because it sits at the intersection of anatomy, childhood curiosity, and everyday observation.

What’s Confirmed vs. What’s Unclear

  • The belly button is a scar from the umbilical cord.
  • Everyone born with a typical umbilical cord has one.
  • It serves no biological function after birth.
  • Its appearance depends on healing patterns, not how the cord was cut.

Unclear or Variable

  • Exact cosmetic outcomes vary based on:
    • Skin elasticity
    • Scar tissue formation
    • Minor anatomical differences at birth

There is no medical mystery here - just natural variation in healing.

What People Are Getting Wrong

Several common misconceptions persist:

  • “Doctors create innies or outies.”
    False. Belly button shape is determined by how the tissue heals, not by cutting technique.

  • “The belly button connects to something inside.”
    False. After birth, it does not connect to any organ.

  • “It has a purpose in adulthood.”
    False. It has no physiological role.

  • “Outies mean something went wrong.”
    Incorrect. Most outies are harmless and normal.

Real-World Impact (Everyday Scenarios)

Scenario 1: A new parent
A parent notices their baby’s belly button looks different from others. The reality: this is normal variation, not a medical issue.

Scenario 2: An adult concerned about appearance
Someone worries their belly button looks “odd.” Medically, this is almost always cosmetic, not health-related.

Scenario 3: Mild medical relevance
In rare cases, pain, discharge, or swelling at the navel can indicate infection or hernia - not because the belly button is functional, but because it is a natural weak point in the abdominal wall.

Benefits, Risks & Limitations

None biologically after birth.

  • Serves as a visible reminder of fetal development (educational value).

Minimal.

  • Rare infections or hernias can occur, especially if hygiene is poor or after surgery.

The belly button cannot regenerate tissue or reconnect internally.

  • Cosmetic correction, if desired, is surgical only.

What to Watch Next

There is nothing new or evolving scientifically about belly buttons. However, increased public interest in human biology and prenatal education means these foundational questions will continue to trend.

What You Can Ignore Safely

  • Claims that belly buttons store bacteria in dangerous amounts
  • Myths about spiritual or energetic functions
  • Viral claims that belly buttons indicate personality traits

These are not supported by evidence.

Do all humans have belly buttons?
Almost all. Rare surgical or congenital conditions may result in absence or altered appearance.

Why are some belly buttons outies?
Usually due to scar tissue or minor herniation during healing.

Can belly buttons change over time?
Yes. Weight changes, pregnancy, or surgery can alter appearance.

Is it safe to clean the belly button?
Yes. Gentle cleaning is recommended, especially for deeper navels.