10026 Necrotizing Enterocolitis

Overview

Necrotizing enterocolitis (NEC) is a serious illness where part of the intestine gets damaged and its tissue can die. It happens most often in babies born too early (premature babies). When the intestinal wall is harmed, bacteria can leak into the belly or bloodstream, causing severe infection.

NEC is rare, but it is the most common serious intestinal emergency in premature babies. It occurs in about 1 in 1,000 premature births, and more often in the smallest and earliest babies.

NEC mainly affects premature babies in the first few weeks of life, particularly those who are unwell or have low birth weight. It is much rarer in full-term babies, older children, and adults.

Symptoms

Common symptoms

• Swollen, tender, or reddish belly
• Feeding problems, such as vomiting or leaving milk undigested in the stomach
• Blood in the stools or dark, stained nappies
• Being very sleepy, less active, or hard to wake
• Breathing pauses (apnoea) or grunting
• Low body temperature or unstable temperature

Symptoms in children

• NEC is very rare in older children, but if it occurs they may have severe belly pain, vomiting, fever, and bloody diarrhoea. Any child with these symptoms needs urgent medical help.

Symptoms in older adults

• NEC is not a typical condition in older adults. However, older people can get other serious bowel infections or blockages with similar symptoms. Seek urgent care if you or a loved one has severe belly pain, vomiting, or blood in the stool.

Causes

Main causes

• The exact cause is not fully known. It seems to start when the intestine is immature and fragile, allowing bacteria to enter the bowel wall.
• Reduced blood flow to the intestine, which can happen during birth stress or when a baby is unwell, can make the bowel more vulnerable.
• An imbalance of bacteria in the intestine may play a role.

Risk factors

• Premature birth (before 32 weeks)
• Very low birth weight (less than 1,500 grams or about 3.3 pounds)
• Feeding with infant formula rather than breast milk
• Having an infection in the blood or intestine
• Being born after a difficult delivery or with low oxygen levels
• Having a heart condition or other serious medical problems

When to see a doctor

See a doctor urgently if:

• If your baby has any of the emergency-grade symptoms listed above, call your local emergency number by ambulance right away.
• If your baby has blood in the stool, a swollen belly, or green/red vomit, seek emergency care immediately.
• If your baby stops breathing, becomes blue, or is floppy, start CPR if you know how and call emergency services.

Book a routine appointment if:

• If you are worried about your baby’s feeding, nappies, or sleepiness, contact your doctor, health visitor, or baby clinic the same day.
• If a premature baby has any change in feeding pattern, always check in with their neonatal team.

Diagnosis

Doctors diagnose NEC by examining your baby, asking about symptoms, and ordering imaging tests. They will look at X-rays of the belly to see signs of swollen bowel loops or air in the bowel wall, which are clear clues. Blood tests help them check for infection and how well organs are working.

Tests that may be done

• Abdominal X-ray (most common test to see bowel problems)
• Ultrasound of the belly to check bowel blood flow and fluid
• Blood tests to look for infection and organ function
• Stool sampling to check for blood or bacteria

What to expect at your appointment

If NEC is suspected, your baby will be admitted to the neonatal intensive care unit (NICU). Doctors will stop milk feeds and give fluids and medicines through a small tube in a vein. They will watch your baby closely, repeating scans and blood tests as needed. You may not be able to hold your baby right away, but you can talk gently and touch them when the team says it is safe.

Treatment

NEC is treated in a hospital, usually in a neonatal intensive care unit. Treatment begins quickly. The first steps are to rest the bowel, control infection, and support your baby's breathing and blood pressure. Most babies start to improve within days, but they need close monitoring.

Self-care at home

• Follow your healthcare team’s feeding plan exactly. Your baby may need only IV fluids for a while.
• Ask about providing breast milk — pumping and storing your milk can help when feeds are restarted.
• Take care of yourself: eat, rest, and accept help so you can stay strong for your baby.
• Ask the nurses how you can comfort your baby through kangaroo care (skin-to-skin) once the team allows it.

Medical treatments

Medical treatment usually includes stopping all milk feeds for several days to give the intestine time to heal, giving fluids and nutrients directly into a vein (called intravenous or IV feeding), and giving antibiotics to treat or prevent infection. Babies may also receive medicines to help stabilise blood pressure and breathing. The exact plan depends on how severe the condition is, and the medical team will explain each step.

When is surgery considered?

If medical treatment does not work, or if a baby develops a hole in the intestine (perforation), surgery is needed. A surgeon removes the damaged part of the bowel and, in some cases, creates a temporary opening in the belly (stoma) while the intestine heals. This is a complex operation, and the team will support you through every stage.

Living with this condition

After recovery, your baby will need close follow-up appointments to check growth, feeding, and development. Some babies go home with special feeding plans, such as slower feeds or extra breast milk. Keep a routine and ask your team what signs to watch for.

Lifestyle tips

• Keep all neonatal follow-up appointments.
• Ask your doctor before introducing any new foods or bottles.
• Practice good hand hygiene, especially around a recovering baby.
• Reach out for support for your own stress and anxiety — parenting after a NICU stay can be very tough.

Diet and exercise

Breast milk is the healthiest choice for all babies, especially after NEC. The medical team will decide when to restart milk feeds, usually starting with tiny amounts. Older children and adults who have had NEC may need a balanced diet, but most do not need special restrictions after recovery.

Mental health and emotional wellbeing

Having a baby with NEC is frightening and can feel overwhelming. It is normal to feel anxious, guilty, or exhausted. These feelings are not your fault. Talk to your partner, family, or a counsellor, and ask your baby’s care team about psychological support for parents.

Prevention

Not all cases can be prevented, but there are important ways to reduce risk. For premature babies, feeding breast milk is the strongest protective factor. Doctors also use careful feeding plans and strict infection control in the NICU to lower the chances of NEC.

Vaccines

There is no vaccine that directly prevents NEC. However, keeping your baby up to date with routine vaccinations helps prevent other infections that could weaken their health.

Screening programmes

There is no routine screening test for NEC in all newborns. However, babies born early are watched closely by neonatal teams, who check for early signs like feeding intolerance and belly swelling.

Complications

If left untreated

• Severe infection spreading through the intestine into the bloodstream (sepsis)
• A hole in the intestine (perforation) leading to belly infection
• Damage to the bowel that can cause narrowing (stricture) and blockages later
• Permanent loss of a large part of the intestine, which can cause long-term digestive problems
• Life-threatening shock and, in the most severe cases, death

Long-term outlook

Many babies with NEC recover completely with careful treatment, especially when caught early. Even after surgery, most children lead full, healthy lives, though some may need extra feeding support or further surgery as they grow. Your medical team will work with you to give your baby the best possible chance, and there is real hope for the future.

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