Many pregnant people notice their belly button, or umbilicus, changing shape. While the expectation that an “innie” will “pop out” is widespread, it is completely normal for the belly button to simply flatten or remain recessed throughout pregnancy. This variation is due to a combination of internal pressure dynamics and individual anatomical differences.
The Anatomy Behind the Change
The shift in the belly button’s appearance is a direct mechanical consequence of the growing uterus. As the fetus develops, the uterus expands significantly, pressing against the abdominal wall, typically starting around the second trimester. This internal pressure pushes the abdominal contents forward.
The belly button is a scar, representing the former insertion point of the umbilical cord. This area is a naturally weaker point in the abdominal fascia, the tough connective tissue that holds internal organs in place. When the uterus pushes forward, it exerts tension on this fascia and the skin around the navel.
This stretching force can cause the indentation to flatten, making the navel flush with the surrounding skin. If the internal pressure is substantial enough, it pushes the scar tissue outward, creating the “popped” look. The abdominal wall’s resistance determines the final appearance of the umbilicus.
Factors Determining Eversion
The reason the belly button may not pop out lies in individual anatomical variation and the specific dynamics of the pregnancy. The initial depth of the navel is a significant factor; a person with a naturally deep “innie” requires more stretching before eversion occurs. In these cases, the navel may only flatten or become shallower.
The structure and elasticity of the abdominal wall also play a determining role. The thickness and stretchiness of the connective tissue and fascia surrounding the navel resist the outward pressure from the uterus. A firmer, less elastic abdominal wall holds the navel in place more effectively than one that stretches easily.
The specific position of the uterus relative to the abdominal wall affects where the pressure is concentrated. If the uterus is positioned or tilted in a way that directs less force toward the navel, eversion is less likely. The rate at which the skin stretches and weight is gained also influences the outcome, as slower expansion allows the skin and fascia to accommodate pressure without a dramatic outward change.
Navigating Umbilical Changes
Whether the navel everts or remains recessed, the stretching skin in this area can become sensitive and prone to irritation. It is common to experience mild soreness, tenseness, or itchiness as the skin accommodates the increasing size of the abdomen. Applying a moisturizing lotion or anti-stretch mark cream regularly can help soothe the skin and reduce dryness.
If the belly button protrudes or remains recessed, friction from clothing may cause discomfort. Wearing loose-fitting clothing or covering the area with a soft cotton or adhesive bandage can protect the sensitive skin from rubbing against fabric.
While most changes are harmless, specific signs warrant a consultation with a healthcare provider. Seek medical advice if the area develops a painful, firm bulge that does not recede when lying down, as this could indicate an umbilical hernia. Though umbilical hernias during pregnancy often resolve after delivery, sudden, severe pain or any sign of infection requires immediate medical evaluation.