Green Poop in Babies
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, AAP, CDC guidelines
Last reviewed:
Digestive issues are common in infants and toddlers. If your baby is experiencing green poop in babies, here is what you need to know.
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.
Key takeaways
- 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.
- Usually normal when: Your newborn is passing dark green transitional stools in the first week of life
- Call your doctor if: You see blood (red or dark streaks) mixed in with green or any colour stool
- Varies by age — see the age-by-age breakdown below
“The biggest concern with vomiting is dehydration. Young children can become dehydrated quickly, so it's important to replace fluids. Offer small amounts of an oral rehydration solution frequently.”
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What Parents Should Know
According to AAP, CDC guidelines, 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. At 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. It is generally considered normal when your newborn is passing dark green transitional stools in the first week of life. However, you should contact your pediatrician promptly if you see blood (red or dark streaks) mixed in with green or any colour stool.
Normal vs. Concerning
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 to Tell Your Pediatrician
- Describe when you first noticed green poop in babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if green stools are accompanied by mucus or a slimy texture consistently over several days.
- Mention if 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.
- Bring a list of any questions or observations you want to discuss at the appointment.
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
What You Can Do at Home
- Keep track of when you notice green poop in babies — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that your newborn is passing dark green transitional stools in the first week of life — this is generally within the range of normal.
- At 0-5 days, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Keep your baby upright for 20-30 minutes after feeding. Note any patterns between feeds and symptoms.
- While monitoring at home, seek immediate care if you see blood (red or dark streaks) mixed in with green or any colour stool.
Related Resources
Milestone Checklists by Age
Track your baby's developmental milestones from birth to 5 years with age-specific checklists.
Poop Color & Texture Guide
What your baby's poop color and consistency mean, and when to worry.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is green poop in babies normal?
When should I call the doctor about green poop in babies?
When is green poop in babies normal?
What causes green poop in babies?
What should I mention to my pediatrician about green poop in babies?
Is green poop in babies normal at 0-5 days?
Is green poop in babies normal at 1 week - 3 months?
Should I go to the ER for green poop in babies?
Does green poop in babies go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Green Poop in Babies.
Things to mention
- Describe when you first noticed green poop in babies and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if green stools are accompanied by mucus or a slimy texture consistently over several days.
- Mention if 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.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- 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
Urgent signs to report immediately
- 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
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of green poop in babies are normal. Talk to your pediatrician if you see blood (red or dark streaks) mixed in with green or any colour stool.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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