A baby who was playing happily suddenly screams, settles after a few minutes, and then starts again a short while later. Many parents wonder whether this is colic or something more serious. This pattern can be a classic picture of intussusception, so knowing it may help you act quickly.

Why It Happens: One Part of the Bowel Slides Into Another

Intussusception happens when one segment of the intestine slides into the section just beyond it, like a telescope folding in on itself. The folded segment can block the passage of food and fluid, and over time the blood supply to that part of the bowel can be reduced and the tissue damaged. Mayo Clinic Care Network content describes intussusception as a condition that needs emergency medical care. In young children, it often occurs without a clear underlying cause.

How It Looks at Different Ages

It mainly affects babies and toddlers. Sidra Medicine’s family leaflet describes it as common between about 3 months and 5 years of age, and other pediatric references describe the peak in the first year of life. Because infants cannot say where it hurts, the pattern of crying is the most important clue. Some older children have only repeated stomach pain, which can make the condition harder to recognize.

What You Can Look For at Home

  • Crying pattern: pain often comes in waves, usually every 15 to 20 minutes at first, and the episodes tend to last longer and come more often as time passes.
  • Posture: babies may pull their knees up to the chest while crying, and may seem quiet or limp between episodes.
  • Vomiting: repeated vomiting is common and may turn green later.
  • Stool: stool mixed with blood and mucus, sometimes described as currant jelly, tends to appear later. Many children do not have bloody stool early on, so its absence is not reassuring.
  • Belly: a sausage-shaped lump is sometimes felt in the abdomen.
  • Energy: unusual sleepiness or limpness can be the only sign in some babies.

If several of these signs appear together, getting evaluated early is generally safer than waiting. Avoid giving enemas or trying other treatments at home.

Common Points of Confusion

  • Colic versus intussusception: colic is typically evening fussiness without vomiting, bloody stool or limpness. Crying spells combined with those signs call for a different explanation.
  • Stomach bug: diarrhea and vomiting can look like gastroenteritis, but pain spells and blood or mucus in the stool deserve an exam.
  • Anal fissure: a fissure usually leaves a streak of bright red blood on the outside of a formed stool, while intussusception stool is more often mixed with mucus and looks like jelly.
  • Late blood: sources note that bloody stool is often a later sign and may be absent at first.

When to Go to the Emergency Room Right Away

Go to the emergency room right away if a baby has repeated spells of intense crying with drawn-up knees, ongoing vomiting, blood or mucus in the stool, unusual drowsiness or limpness, or a swollen or tender belly. Diagnosis usually relies on an abdominal ultrasound, and when found early many children can be treated without surgery. Delays can allow the affected bowel to be damaged, so time matters. If symptoms pass but the same pattern returns, it is also reasonable to talk with a pediatrician. This information is based on U.S. and international pediatric hospital 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.