Blood in Baby's Diaper or Rectal Bleeding
The short answer
Finding blood in your baby's diaper can be alarming, but the most common cause is an anal fissure - a tiny tear in the skin around the anus caused by passing a hard stool. This produces small amounts of bright red blood on the outside of the stool or on the diaper. Other common causes include milk protein allergy (in breastfed babies whose mothers consume dairy), swallowed blood from a cracked nipple (in breastfed babies), and constipation. While small amounts of bright red blood from a fissure are common, any significant or persistent rectal bleeding should be evaluated by your pediatrician.
Parents everywhere have the same worry. You are doing the right thing by looking into it.
By Age
What to expect by age
0-12 months
Blood in a young baby's stool is most commonly caused by: milk protein allergy or intolerance (small streaks of blood and mucus in otherwise normal stool), swallowed maternal blood from cracked nipples during breastfeeding, or a small anal fissure from constipation. In breastfed babies, blood-streaked mucousy stools that are otherwise normal in frequency may indicate a cow's milk protein sensitivity passed through breast milk. Always report blood in a young baby's stool to your pediatrician for proper evaluation.
1-3 years
The most common cause of rectal bleeding in toddlers is an anal fissure from constipation. Hard stools stretch and tear the delicate skin around the anus, causing bright red blood on the stool surface, in the diaper, or on toilet paper. The toddler may cry or resist having bowel movements due to pain. Treatment focuses on softening stools with adequate fluids, fiber, and sometimes stool softeners. Less common causes include bacterial infections, polyps, and inflammatory conditions. If blood is persistent, dark, or mixed into the stool, see your pediatrician.
What Should You Do?
When to take action
- A tiny amount of bright red blood on the outside of a hard stool (likely anal fissure)
- Blood that resolves once constipation is treated and stools soften
- A one-time episode of streaky blood with an otherwise well baby
- Blood in stool occurs more than once or twice
- Blood is mixed into the stool rather than just on the surface
- Your breastfed baby has bloody mucousy stools (possible milk protein allergy)
- Your child has recurrent anal fissures from chronic constipation
- Large amounts of blood or blood clots in the stool
- Dark, tarry, or black stools (suggests bleeding higher in the digestive tract)
- Bloody stool with severe abdominal pain, especially if the pain comes in waves (possible intussusception)
- Blood in stool with fever, diarrhea, and your child appearing very ill
- "Currant jelly" stool - dark red, jelly-like stool (possible intussusception - emergency)
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Digestive Concerns
Baby Constipation
Constipation in babies is defined by hard, dry, difficult-to-pass stools rather than by how often your baby poops. Breastfed babies can go several days without a bowel movement and still be perfectly normal. If your baby is passing soft stools comfortably, even if infrequently, they are likely not constipated.
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.
Tummy Massage for Baby Gas
Gentle abdominal massage can help relieve gas and discomfort in babies by encouraging gas to move through the intestines. The technique involves gentle clockwise circular motions on the belly (following the direction of the digestive tract), the "I Love U" stroke pattern, and gentle knee-to-tummy movements. Massage also provides comforting touch that can soothe a fussy baby.
Silent Reflux in Baby
Silent reflux occurs when stomach acid rises into the esophagus and throat but is swallowed back down rather than spit up. Babies with silent reflux may be fussy during or after feeds, arch their back, have hoarse crying, or refuse to eat, but without visible spitting up. It can be harder to diagnose than typical reflux because there is no obvious spit-up.
Bicycle Legs Technique for Gas
Bicycle legs is a simple, effective technique for helping babies pass trapped gas. Gently moving your baby's legs in a cycling motion pushes against the abdomen and helps gas move through the intestines. Combined with gentle belly massage and tummy time, it is one of the best non-medical approaches to gas relief in infants.