You change a nappy, the baby cries, and suddenly there's a fleshy lump the size of a marble bulging out of the belly button. The first time, it looks like something has gone seriously wrong. It hasn't. Umbilical hernias are one of the most common findings in babies, the cause is mechanical and harmless, and the answer for the great majority is to do absolutely nothing and let time fix it.
Healthbooq covers what's normal in babies and what to look for at each stage.
What's Actually Happening
Before birth, the umbilical cord runs through a small opening in the abdominal wall called the umbilical ring. After the cord falls off, that ring is supposed to close as the muscle on either side comes together. In some babies, the ring doesn't fully close, and a little of what's behind it — usually a fold of the lining of the abdomen, sometimes a tiny loop of bowel — pushes through under the skin of the belly button. That's the bulge you're seeing.
A few features tell you it's a typical umbilical hernia:
- Soft and squashy. You can gently press it back in and feel a small ring underneath.
- Bigger when she cries, strains, or sits up. Anything that raises pressure inside the abdomen pushes more out.
- Smaller or gone when she's relaxed and lying flat.
- Doesn't hurt. Pressing on it doesn't make her cry.
- Skin over it looks normal. Maybe stretched, but not red, not shiny, not blistered.
Umbilical hernias are common everywhere, more common in premature babies (their umbilical ring had less time to close), and especially common in babies of Black African or Caribbean heritage — sometimes very prominent, which can be alarming if no one's warned you, but the natural history is the same.
What Happens If You Leave It Alone
The honest answer is that it almost certainly closes by itself. Roughly 80–90% of umbilical hernias have closed by age 2, and most of the rest close by age 4. Smaller defects (under about 1 cm across the ring) close fastest. Big ones can take longer but still usually settle.
What you do not need to do — and please do not do — is tape a coin over it, tape anything over it, or use one of the abdominal binders that pop up in baby groups. None of these speed up closure. Some of them macerate the skin, and a couple of times a year a paediatrician sees a baby whose belly button has been damaged by Sellotape and homemade pressure dressings. The ring closes when the muscle is ready, not because of pressure on the skin.
There's nothing you need to monitor at home beyond noticing it and showing your GP at any routine check, who'll measure it once or twice over the months and years and decide if a referral is sensible.
When Surgery Comes Into the Picture
Surgical repair is reasonable for:
- Hernias that haven't closed by age 4 or 5. The ring isn't going to close on its own at that point, and most paediatric surgeons will offer repair before school age both for cosmetic reasons (because children become aware of it) and because the small risk of incarceration accumulates over time.
- Very large hernias — typically a ring over 2 cm at age 2 — which are unlikely to close.
- Symptomatic hernias — actual pain, episodes of getting stuck, repeated discomfort.
The operation is a standard day case: general anaesthetic, a small incision in the natural skin crease of the belly button (so the scar is hidden), the ring is closed with stitches, home the same afternoon. Recovery is straightforward, with normal activity in about a week.
The Sign That Means A&E
Incarceration — where bowel gets stuck in the hernia and can't slip back in — is genuinely uncommon in umbilical hernias (much more common with inguinal hernias). But it's the one thing every parent needs to know:
- The bulge becomes suddenly hard instead of soft.
- It's tender when you touch it.
- You can't push it back in.
- The baby is distressed, crying, vomiting, or off feeds, and may have a swollen belly.
That picture is A&E by ambulance — not the GP, not a wait-and-see. Strangulation (the bowel losing its blood supply) is the real risk if it isn't relieved promptly.
For comparison, the everyday picture — a soft bulge that pops out when she cries and disappears when she's calm, with no other symptoms — is the normal version, and is precisely what 99% of umbilical hernia presentations look like.
A Word on the Cosmetic Question
Some parents — and grandparents — find an outie belly button quite disconcerting and ask whether something can be done sooner for cosmetic reasons. The answer in toddlerhood is usually no, because the rate of spontaneous closure is high enough that it's worth waiting. Once the child is approaching school and the hernia clearly isn't going to resolve, an elective repair becomes a reasonable conversation. The end result is a normal-looking navel.
Key Takeaways
The little soft bulge at your baby's belly button that pops out when she cries is almost always an umbilical hernia, and almost always nothing to worry about. Around 8 or 9 in every 10 close themselves by age 2 or 3 — no taping, no coins, no binders, all of which are old wives' tales that do nothing useful and can damage the skin. Surgery is reserved for the small minority that haven't closed by 4 or 5, or hernias bigger than 2 cm at age 2. The only urgent picture is incarceration: a bulge that suddenly becomes hard, tender, won't go back in, and the baby is in pain or vomiting — that's A&E.
