It is a common expectation that a growing abdomen during pregnancy will cause the navel, or belly button, to shift from an “innie” to a temporary “outie.” However, the experience varies widely, and many people progress through their entire pregnancy without their navel ever protruding. Understanding the underlying anatomy and the factors that influence this change can help demystify this normal part of the physiological journey.
The Anatomy Behind Belly Button Changes
The navel is a scar, the remnant of where the umbilical cord once connected to the fetus. It is situated in the thinnest part of the abdominal wall, a spot known as the umbilical ring. As the fetus grows, the uterus expands upward and outward, typically rising to the level of the navel around the 20th week of gestation.
This continuous expansion of the uterus creates internal pressure on the abdominal wall. The skin and underlying muscles stretch to accommodate the growing volume, which naturally pushes against the navel. For many, this pressure flattens the navel or forces the scar tissue outward, creating the temporary “outie” appearance. This protrusion is simply a result of the abdomen inflating.
Why Some Navels Remain Innies
For many pregnant individuals, the navel remains an “innie” or simply flattens out, which is a completely normal outcome. This difference is largely determined by the specific anatomical structure of the abdomen before conception. The natural depth and shape of the navel play a substantial role, as a deeply inverted navel requires significantly more internal pressure to push it past the surrounding abdominal skin.
The amount of subcutaneous fat tissue surrounding the abdomen also influences the change; more tissue can provide a cushion that prevents the navel from protruding. Furthermore, the tautness and structure of the abdominal fascia and muscles vary between individuals. A strong, less flexible abdominal wall or the presence of pre-existing scar tissue can resist the outward pressure, keeping the navel recessed or merely flattened.
Addressing Common Discomforts and Myths
The stretched skin around the navel can become a source of mild discomfort for some people. Itchiness, soreness, or tightness are common complaints, often due to the skin stretching rapidly during the second and third trimesters. Applying a gentle, hypoallergenic moisturizer can help soothe the skin and reduce irritation caused by friction with clothing.
There is a myth that the navel’s appearance can predict the baby’s gender or health, which has no scientific basis. Concerns about the change being permanent are also unfounded, as the vast majority of navels return to their pre-pregnancy shape within a few months after delivery. During the postpartum period, the internal abdominal pressure decreases, allowing the stretched tissues to retract. Taping the navel or wearing specialized supports is unnecessary and ineffective at preventing the change, which is driven by internal uterine pressure.
When to Consult a Healthcare Provider
Although the cosmetic changes to the navel are typically benign, certain symptoms warrant a discussion with a healthcare provider. Mild pain is often a result of ligament and skin stretching, but severe, sharp, or constant pain requires medical attention. Discoloration, such as a blue or purple hue around the navel, or signs of infection like bleeding or pus, should also be evaluated.
The main concern is the development or worsening of an umbilical hernia, which occurs when internal tissue pushes through a weak spot in the abdominal wall near the navel. While most pregnancy-related umbilical hernias are small and harmless, a hernia that becomes suddenly hard, tender, or cannot be gently pushed back in could indicate a rare complication known as strangulation. Reporting any visible soft lump or bulge that grows when coughing or straining is prudent, even if it is not immediately painful.