A belly button that pops out like a small ball when a baby cries can be alarming. It is usually an umbilical hernia, and most cause no problems.
Why It Happens
HealthyChildren.org explains that the umbilical cord passes through a small opening in the baby’s abdominal muscles before birth. When that opening does not fully seal afterward, a small gap remains under the belly button, which is an umbilical hernia. The site describes roughly one in five newborns as having such a gap. When a baby cries, coughs, or strains, pressure inside the belly rises and pushes a bit of intestine or fatty tissue into the gap, creating a bulge. Once the baby relaxes, the bulge often flattens again. It rarely seems to bother the baby.
How It Differs by Age
According to HealthyChildren.org, umbilical hernias typically heal on their own by about 12 to 18 months, and most close by around age 4. The site notes that the size of the muscle opening predicts closure better than how far the bulge sticks out. A five-year follow-up cohort discussed in AAP Grand Rounds found that about 89% closed on their own by age 5. Among children who still had a hernia at age 3, about 20% had closed by age 4 and roughly 35% by age 5. Because of this, pediatricians usually recheck the size at routine visits rather than rushing toward surgery. AAP material suggests a surgical consultation for a symptom-free hernia around age 4, and early repair before age 4 is generally not needed when there are no symptoms.
Care at Home
Most babies need no treatment. Keep the area clean and dry, and glance at the bulge now and then: does it go back in when your baby is calm, and is it staying about the same size? Folding the diaper below the navel can keep urine and stool away. If your baby strains often with hard stools, ask the pediatrician about feeding and bowel habits. Taking a photo once a month in the same position can help you describe any change at checkups.
Common Misunderstandings
A popular belief is that taping a coin or a tight band over the navel will push the hernia in. HealthyChildren.org says taping a coin does not help and may cause a skin rash. Another idea is that crying causes the hernia, so parents try never to let the baby cry. Crying only makes an existing gap more visible; it does not create it. A third worry is that a bigger bulge is always more dangerous, yet the opening size and symptoms matter more than the bulge’s shape.
When to Seek Medical Care
Very rarely, intestine becomes trapped in the hernia sac (incarceration). Go to the emergency room right away if the bulge stays out while your baby is calm, feels firm, turns red or purplish, or if your baby is vomiting repeatedly, has a fever, refuses to feed, or seems to be in pain. If the bulge does not slip back in with gentle pressure, do not force it; seek care promptly. Outside emergencies, talk with your pediatrician if the bulge is growing quickly or has not closed by about age 4, since a pediatric surgeon may then discuss repair. This information is based on U.S. (AAP) guidance; if you live elsewhere, check with a local pediatrician for country-specific recommendations. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.