Green Poop in Babies
The short answer
Green poop in babies is almost always completely normal and nothing to worry about. It can be caused by iron in formula or supplements, a foremilk-hindmilk balance in breastfeeding, dietary changes, or simply normal variation in how quickly food moves through the gut.
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By Age
What to expect by age
0-5 days
In the first few days, your baby passes meconium, a dark greenish-black, sticky stool. This is completely normal and expected. Over the next few days, stools transition through dark green to yellow-green and then to the typical colour for your baby's feeding type. This progression is actually a reassuring sign that feeding is going well.
1 week - 3 months
Breastfed babies typically have yellow, seedy stools, but occasional green stools are very common. This can happen if your baby gets more foremilk (the thinner milk at the start of a feed), if you eat certain green foods, or simply as normal variation. Formula-fed babies often have greener, more paste-like stools, especially with iron-fortified formula.
3-6 months
Green poop continues to be a normal variation. If your baby has started iron supplements (often recommended around 4 months for breastfed babies), dark green or greenish-black stools are a very common and harmless side effect. Illness with a tummy bug can also temporarily turn stools green.
6-12 months
Once your baby starts solid foods, you may see a whole rainbow of stool colours depending on what they eat. Green vegetables like peas, beans, and spinach can turn stools quite dramatically green. This is completely harmless and shows your baby is eating their greens.
12 months+
As your toddler's diet expands, green stools remain a normal variation. Bright green can come from food colouring in some snacks and drinks. As long as your child is well, eating normally, and not in pain, green poop on its own is not a concern.
What Should You Do?
When to take action
- Your newborn is passing dark green transitional stools in the first week of life
- Your formula-fed baby has greenish stools, which is common with iron-fortified formula
- Your breastfed baby has occasional green stools but is feeding well and gaining weight
- Your baby started iron drops and their stools turned dark green or greenish-black
- Your baby recently started solids and has green stools after eating green vegetables
- Green stools are accompanied by mucus or a slimy texture consistently over several days
- Your breastfed baby has persistently green, frothy stools and seems unsettled after feeds, which may suggest a foremilk-hindmilk imbalance worth discussing with a lactation consultant
- Your baby has green stools alongside other symptoms like a rash, excessive fussiness, or poor weight gain, which could occasionally suggest a food sensitivity
- You see blood (red or dark streaks) mixed in with green or any colour stool
- Your baby has pale, chalky white or very light grey stools, as this can indicate a liver or bile duct issue and needs urgent medical attention
- Your baby has green watery diarrhoea many times a day and shows signs of dehydration such as fewer wet nappies, no tears, or a sunken soft spot
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
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.
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.