Meckel's Diverticulum Signs in Baby
The short answer
Meckel diverticulum is a congenital outpouching of the small intestine present in about 2% of the population. Most people never know they have it. When symptomatic, it most commonly causes painless but significant rectal bleeding (usually dark red or maroon) in children under 2 years. It can also cause bowel obstruction or inflammation mimicking appendicitis.
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By Age
What to expect by age
Meckel diverticulum can rarely cause symptoms in newborns, including intestinal obstruction or bleeding. Significant painless rectal bleeding in a young infant should prompt evaluation for Meckel diverticulum among other causes.
Bleeding from Meckel diverticulum may begin at this age. The blood is typically dark red or maroon (brick-colored) because it originates from acid-secreting tissue within the diverticulum that ulcerates nearby intestinal lining. The bleeding can be significant and episodic.
This is a common age for Meckel-related bleeding to present. The classic presentation is painless, significant rectal bleeding in an otherwise healthy child. A Meckel scan (technetium nuclear medicine scan) can help diagnose it. If positive, surgical removal of the diverticulum is curative.
Most symptomatic Meckel diverticulum presents before age 2. In addition to bleeding, it can cause obstruction (from intussusception around the diverticulum) or inflammation similar to appendicitis. Any significant painless rectal bleeding in a toddler should be evaluated.
What Should You Do?
When to take action
- Having a Meckel diverticulum is common (2% of people) and most never have symptoms
- Your child has had an episode of painless rectal bleeding that resolved on its own
- Significant painless rectal bleeding (dark red or maroon stools) in a child
- Signs of bowel obstruction: bilious vomiting, abdominal distension, and pain
- Pallor or signs of anemia from recurrent bleeding episodes
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Digestive Concerns
GI Bleeding Causes in Baby
Gastrointestinal bleeding in babies has many possible causes, most of which are benign. The most common cause of rectal bleeding is an anal fissure from constipation. Other causes include cow's milk protein allergy, infectious colitis, Meckel diverticulum, and intussusception. The color and amount of blood, along with associated symptoms, help determine the urgency and cause.
Blood in Baby's Stool
Seeing blood in your baby's stool is understandably alarming, but the most common cause in young babies is a small anal fissure (a tiny tear from passing stool) or swallowed maternal blood from cracked nipples during breastfeeding. However, blood in stool always deserves medical evaluation to rule out less common but important causes like a cow's milk protein allergy or infection.
Dark Blood in Baby's Stool
Dark or black blood in stool (melena) is different from bright red blood and may indicate bleeding from the upper digestive tract (stomach or upper intestine). In newborns, black stools in the first few days (meconium) are normal. Beyond the first week, dark, tarry, or coffee-ground-like material in stool needs prompt medical evaluation. Some dark-colored foods and iron supplements can also darken stools without being blood.
Signs of Intussusception in Babies
Intussusception is a serious but treatable condition where part of the intestine telescopes into itself, causing a blockage. The classic signs are sudden episodes of severe pain (baby screams and pulls legs up), vomiting, and eventually "currant jelly" stools (blood and mucus). It's most common between 6-18 months and requires immediate emergency care.
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.