Newborn poop is one of those topics nobody warns you about before the baby arrives. The colours, the textures, the sheer frequency of it. And yet, in those early days, it is one of the best indicators of how well your baby is feeding and growing.

Here is some reassurance before we dive in: nearly half of all healthy babies have green stools for at least one week in the first four months of life. So if you are already puzzled by the colour in that diaper, you are in very good company.

The first week, day by day

Days 1 to 3: meconium. Your baby's first bowel movements will be thick, sticky and dark greenish-black. This is meconium, and it is completely normal. It is made up of everything your baby ingested in the womb. It can be a shock to see, but passing meconium in the first 48 hours is a reassuring sign that the digestive system is working. A full-term baby who has not passed stool within 48 hours of birth should be assessed by a provider.

Days 3 to 5: transitional stools. As feeding gets established, poop will shift from black to greenish-brown to yellow or tan. This change tells you your baby is digesting milk properly. It is one of the most reassuring progressions in the first week.

Normal colours at a glance

Not every colour needs action. The ones that do are marked clearly.

COLOUR	WHAT IT USUALLY MEANS	WHAT TO DO
Yellow or mustard	Normal for breastfed and formula-fed babies, often seedy	Nothing needed
Light brown or tan	Normal, especially in formula-fed babies	Nothing needed
Green	Common and normal in nearly half of healthy babies	Nothing needed
Dark greenish-black	Meconium, days 1 to 3. Normal first stools	Expected and normal
White, pale grey or clay	May indicate a bile flow problem	Call your provider today. Take a photo
Bright red blood	Small streaks may be an anal fissure	Call your provider. Emergency if a large amount
Black after day 3	May indicate bleeding in the upper digestive tract	Call your provider today

CANADIAN RESOURCES

Ontario and BC both run Infant Stool Colour Card programs for biliary atresia screening. Newborn Screening Ontario and Perinatal Services BC provide colour cards to families at discharge. If you received one, use it to check your baby's stool colour daily for the first month of life.

How often should your baby be pooping?

Stool frequency peaks around 3 weeks of life and varies considerably between breastfed and formula-fed infants. Both patterns are normal.

AGE	BREASTFED	FORMULA-FED
Month 1	4 to 5 times a day, range 1 to 10 or more	2 to 3 times a day
Month 2	About 3 times a day	1 to 2 times a day
Month 3	About 2 times a day	1 to 2 times a day

IMPORTANT

After the first month, some breastfed babies absorb milk so efficiently that they may only poop once every few days, or even once a week. As long as the stool is soft when it comes, your baby is comfortable, and feeding is going well, this is usually normal.

What normal poop looks like

Breastfed babies: soft, loose, sometimes watery. Often seedy or curdled, like cottage cheese mixed with mustard. Runny stools in a breastfed baby are not diarrhea.

Formula-fed babies: thicker and more paste-like, similar to peanut butter. Firmer than breastfed stools but still soft. Both are normal. The difference is simply about what is in the milk.

When to call your provider

• No stool in the first 48 hours of life for a full-term baby

• White, pale grey or clay-coloured stools at any point. Call the same day and take a photo

• Watery, explosive diarrhea alongside fever, poor feeding, or fewer wet diapers

• Black stools after the first three days of life

• Bright red blood in the stool. Small streaks are often a minor fissure but still worth a call

• Very hard, pebble-like stools with signs of discomfort or straining

• Fewer than 3 to 4 wet diapers per day after the first few days

• Poor weight gain, a swollen or hard belly, or vomiting

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Practical tips for the early weeks

• Count diapers in the first week. Tracking wet and dirty diapers helps confirm your baby is getting enough to eat

• Take a photo if you are worried about colour. It is much easier to show your provider than to describe it

• Expect changes if you switch formulas. Green stools are especially common with iron-fortified formulas

• When solids start at around 6 months, stools become firmer, darker and smellier. You may see undigested food. This is normal

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How SuperNurse helps

In those first days home, poop questions come up constantly, usually at 2am when you are not sure if what you are seeing is normal and your provider's office does not open for hours. Our Licensed Nurses are trained to assess exactly this, in real time, in your home:

• Assess stool colour and consistency with a trained clinical eye

• Help you track feeding, wet diapers and bowel movements in the first week

• Tell you clearly whether what you are seeing is normal or needs a call to your provider

• Support breastfeeding to help ensure your baby is getting enough, which is directly linked to healthy stool output

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And if something does need attention, our Nurse Practitioner is available virtually. You may not need to leave home.

https://youtu.be/prX6rjd52Uc?si=roThHaA-R7jPX1JG

WATCH

What a normal diaper looks like

A walk through the first week of diaper changes, colour by colour, and the signs worth a call.

SOURCES

1. Solasaari et al. Bowel Function in a Prospective Cohort of 1052 Healthy Term Infants. European Journal of Pediatrics. 2024.

2. den Hertog et al. Defecation Pattern of Healthy Term Infants Up to 3 Months. ADC Fetal and Neonatal Edition. 2012.

3. Harpavat et al. Guidance for Identifying Infants With Biliary Atresia. Pediatrics. 2025.

4. Newborn Screening Ontario. Biliary Atresia Screening Program.

5. Perinatal Services BC. Biliary Atresia Home Screening Program.

6. Canadian Paediatric Society. Caring for Kids: Newborn Care.

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Maya Agha, Licensed Nurse

Licensed Nurse and co-founder of SuperNurse. Pediatric emergency and newborn care background, working with families across Toronto.