Meconium Ileus
The short answer
Meconium ileus is a type of neonatal bowel obstruction caused by abnormally thick, sticky meconium that blocks the ileum (last part of the small intestine). It is the earliest manifestation of cystic fibrosis (CF), occurring in about 15-20% of newborns with CF. It requires immediate medical evaluation and treatment, which may be non-surgical (contrast enema) or surgical depending on severity and complications.
By Age
What to expect by age
Meconium ileus typically presents within the first day of life with signs of intestinal obstruction: abdominal distension, failure to pass meconium, and bilious (green) vomiting. The abdomen may appear visibly swollen and feel doughy. Sometimes, thickened loops of intestine can be felt or seen through the thin abdominal wall. Prenatal ultrasound may have shown dilated bowel or a hyperechoic (bright) mass, raising suspicion before birth. An abdominal X-ray will show dilated loops of bowel and may show a characteristic "soap bubble" or "ground glass" appearance in the right lower abdomen.
Diagnosis is typically confirmed through imaging studies. A contrast enema using water-soluble contrast (Gastrografin) can be both diagnostic and therapeutic, as the hyperosmolar contrast can help loosen and evacuate the thick meconium plug. This succeeds in approximately 50% of uncomplicated cases. If the contrast enema does not relieve the obstruction, or if there are complications such as volvulus (twisting of the bowel), atresia (absence of part of the bowel), or perforation, surgery is required. The surgical team will also test for cystic fibrosis, as it is the underlying cause in the majority of cases.
After successful treatment (either by contrast enema or surgery), the baby will remain in the hospital for recovery. Feeding is gradually introduced once bowel function resumes (indicated by passing stool and tolerating feeds without vomiting). Genetic testing for cystic fibrosis (sweat chloride test and/or genetic analysis) will be performed. If CF is confirmed, the baby will be started on pancreatic enzyme replacement therapy to aid digestion and connected with a CF care team. Recovery from uncomplicated cases is generally good.
If cystic fibrosis has been confirmed, ongoing management includes pancreatic enzyme replacement with feeds, monitoring of growth and nutrition, and connection with a specialized CF center. Babies who had surgical treatment will need follow-up to ensure the bowel is functioning normally and there are no complications such as adhesions or strictures. Even if the immediate obstruction is resolved, close developmental and nutritional monitoring is important. With modern CF treatment, outcomes have improved significantly.
What Should You Do?
When to take action
- The meconium ileus was treated successfully and the baby is now passing stool and feeding well
- Genetic testing has been completed and results have been reviewed with your medical team
- The baby is growing well on pancreatic enzyme replacement therapy (if CF was confirmed)
- Follow-up imaging or examinations show the bowel is functioning normally after treatment
- Your baby had meconium ileus and you notice any changes in stool patterns, feeding, or growth
- You have questions about cystic fibrosis diagnosis, management, or genetic counseling
- Your baby seems to have difficulty with feeds or is not gaining weight as expected after treatment
- Your newborn has a distended abdomen, is not passing stool, and is vomiting (especially green/bilious vomit), as these are signs of bowel obstruction requiring emergency evaluation
- Your baby who previously had meconium ileus develops new vomiting, abdominal distension, or stops passing stool, as this could indicate a new obstruction or complication
Sources
Related Resources
Related Digestive Concerns
My Baby's Belly Looks Swollen
A rounded, slightly protruding belly is completely normal in babies and toddlers due to immature abdominal muscles and their proportionally larger organs. However, if the belly becomes suddenly swollen, feels hard and tight, or is accompanied by pain, vomiting, or changes in bowel movements, it needs medical evaluation as it could signal gas buildup, constipation, or rarely, something more serious.
My Baby Has an Anal Fissure (Blood When Pooping)
A small streak of bright red blood on the surface of your baby's stool or on the diaper is most commonly caused by an anal fissure, which is a tiny tear in the skin around the anus from passing hard stool. Anal fissures are very common in babies and toddlers and usually heal on their own with simple measures like keeping stools soft. While this is rarely serious, any blood in your baby's stool should be mentioned to your pediatrician.
My Baby Eats Non-Food Items (Pica)
It is completely normal for babies and young toddlers to explore by putting objects in their mouths. True pica, which is the persistent eating of non-food substances, is uncommon before age two and may be linked to iron deficiency or developmental factors. If your child repeatedly seeks out and eats non-food items past the typical mouthing stage, it is worth discussing with your pediatrician.
Baby Burping Too Much or Excessive Gas
Frequent burping in babies is very common and usually normal. Babies swallow air during feeding, crying, and pacifier use, and this air needs to come back up as burps. Breastfed babies tend to swallow less air than bottle-fed babies. Excessive burping is usually caused by swallowing too much air (aerophagia), feeding too fast, an improper bottle nipple flow, or minor digestive immaturity. It is rarely a sign of a medical problem. Ensuring proper latch, paced feeding, and appropriate bottle nipple size can help reduce excessive air swallowing.
Baby Excessive Gas After Starting Solids
Increased gas after starting solid foods is completely normal and expected. Your baby's digestive system is encountering new proteins, fibers, and sugars for the first time and needs time to adapt. The gut bacteria are also diversifying, which naturally produces more gas. This typically improves within a few weeks as the digestive system adjusts to each new food.
My Baby Gulps Air While Feeding
Swallowing some air during feeding is normal for all babies, but excessive air gulping can lead to gas, hiccups, and spit-up. Common causes include fast milk flow, poor latch (if breastfeeding), bottle nipple flow that's too fast or slow, and crying before feeds. Simple adjustments to feeding position, pacing, and equipment can usually help reduce air intake significantly.