Breastfed Baby Poop

What colour is a breastfed baby’s poop? How much poop should there be? Knowing the colour, consistency and amount of poop your breastfed baby produces in the early weeks can be very reassuring as it provides a guide to whether your baby is getting enough milk. Baby poop can also provide other clues about how breastfeeding is going and your baby’s health. This article looks at what to expect in your exclusively breastfed baby’s nappy during the first week of your baby’s life, weeks one to six, and after the sixth week.

Breastfed baby poop in the first week

The very first poop your baby passes on the first day of life is called meconium and will be black, thick and sticky. Over the next few days, breastfed baby poop changes through a sequence of colours as your baby drinks more and more breast milk. The colour of poop generally changes from black on the first day, to dark greeny-black on the second and then to khaki green, brown and finally becomes yellow poop or a mustard colour by the fourth or fifth day. The consistency also becomes more runny and the number of poos per day gradually increases too.

Colour of poop in the first five days

  1. Day one; black poo
  2. Day two; dark green/black poo
  3. Day three; greeny-brown poo
  4. Day four; toffee brown poo
  5. Day five; yellow/mustard poo (plenty, at least three per day!)

A knitted nappy showing these colours:

Knitted breastfed baby poop the first five days.
The changing colours of newborn poop in the first five days of life

Plenty of milk, yellow poop

These colour changes towards yellow poop, along with an increasing number of wet and dirty nappies, are a great way to tell if your breastfed baby is drinking plenty of colostrum—the first secretion from the breasts after giving birth which is rich in antibodies—and later, breast milk. If you are not seeing these colour changes on these days ask for support with breastfeeding to make sure your baby is getting enough breast milk.

Weight loss and poop

During the first five days some babies lose a little weight, newborns can lose up to 7% of their birth weight in the early days of life and this is considered “normal”. When this happens, the daily colour changes in the nappy and the amount of poop can serve as reassurance that breast milk is being swallowed despite a little initial weight loss. However, if your baby continues to lose weight or is not gaining weight coupled with few or no poops, the most likely cause is that your baby is not getting enough breast milk.

Breastfed baby not pooping

If your baby is not pooping the most likely reason will be that he is not getting enough breast milk and this needs urgent attention. The notion that a breastfed baby has no waste and therefore doesn’t poo very often in the first four to six weeks is wrong.

Get breastfeeding help

If your baby isn’t having any dirty nappies (or not many per day), and if the colour hasn’t substantially changed by day four or five, check with your healthcare provider and call an IBCLC lactation consultant or breastfeeding specialist to check your baby’s latch, position, how often you are feeding and whether you are using one breast or two per feed. Watch your baby feeding carefully. If he doesn’t seem to be swallowing milk at the breast, expressing your milk will protect your supply and provide a supplement to feed your baby with until you can get help with breastfeeding.

Breastfed baby poop—weeks one to six

Yellow poop or green?

The usual colour of a breastfed baby’s poo by the end of the first week is yellow, mustard or light brown, however there can be a wide range of normal when it comes to colour and consistency. Breast milk contains traces of the mother’s diet. And so mother’s diet or any medications she (or her baby) are taking may affect the colour and form of her baby’s poop.

Green poop

Green poop is also common, it could be normal for your baby or have one of a number of other explanations. A baby with green poo may have an intolerance to something in his mother’s diet, be suffering from a lactose overload (green, frothy and foamy poop), not be getting enough milk or there may be another reason. See Why is My Breastfed Baby’s Poo Green?, Lactose Intolerance in Babies and Milk Allergy in Babies for more information.

At least three poops per day

Expect frequent copious dirty (yellow or mustard) nappies every day and five or six wet nappies per day in the first six weeks or so. As above, if your baby is not pooping or weight gain is poor, see Is My Baby Getting Enough Milk? and contact your IBCLC lactation consultant for help with breastfeeding.

Diapers. Look for at least three “okay” (thumb and forefinger circle size) diapers each day during the first month or so.

Usually during the first few weeks, exclusively breastfed babies will have many bowel movements every day. Ten a day is not rare and if the baby is content, drinking well at the breast and gaining weight, there is no issue. Furthermore, the amounts of each bowel movement and the colour can be quite variable. One day a baby could have 3 bowel movements, the next day 10 and 5 the day after. What matters is whether the baby is content and drinking well at the breast, not the colour of the bowel movements. Of course, the very dark green, almost black, bowel movements that are meconium are not normal after three or four days of life.

Breastfed baby poop—week six onwards

A breastfed baby’s patttern of dirty nappies can change after around six to eight weeks and they may start having fewer dirty nappies or not pooping every day. This isn’t a concern at this age as long as weight gain continues to be good with plenty of wet nappies as before.

Very infrequent bowel movements

Some well fed breastfed babies may not poop for a week or ten days followed by a big clear out of plentiful soft poop. Because the poop is soft and there’s plenty of it when it comes, this is not constipation. However, although you may be told that this can be normal, it probably isn’t ideal. Your baby may be feeling uncomfortable after this period of time. The most likely cause of infrequent stooling, despite a good breast milk intake and weight gain, is a sensitivity to cows’ milk products coming from the mother’s diet, especially if accompanied with rashes and other symptoms of allergy 1.

The colour of poop

As with weeks one to six, the usual colour of breastfed baby poop is yellow or mustard and there are also several possible causes of green poop see Why is My Breastfed Baby’s Poo Green? Any concerns about the colour of your baby’s poop should be reported to your baby’s doctor and especially in the following situations:

Black poop

Very dark or black poop (other than the first few days of black meconium) could be due to digested blood due to bleeding somewhere in the gastrointestinal system and should be reported to your health professional urgently. If a baby drinks a lot of blood stained breast milk due to his mother’s cracked nipples this may also cause very dark coloured poop, check with your health professional and see Blood in Breast Milk.

Red poop

If there is any bleeding lower down in your baby’s gut it may show as red streaks in your baby’s nappy as it won’t have had time to be digested. Traces of blood may be seen if a baby has allergic proctocolitis but there are other possible medical causes of bleeding. Report all cases of blood in the nappy to your doctor.

Pale or white poop, greasy fatty poop

Very pale or chalky white stools or stools that appear “fatty” or “greasy” should always be reported to your health professional. See What are the Symptoms of Jaundice? for further information.

Mucous in poop

Small lumps or strings of clear mucous may be seen in your baby’s nappy from time to time, mucous is produced in the bowel to lubricate the stool and is normal. But if there are frequent large amounts this may be due to some irritation in the intestines such as food allergy or sensitivity, an infection or it could be associated with other health issues—discuss with your doctor to rule out any concerns.

Unusual coloured poop

Unusual colours of an exclusively breastfed baby’s poop can be due to artificial food colouring, natural food pigments or medications in his mother’s diet.

After solids

Once solids are introduced, or formula, breastfed baby poop will change in appearance becoming browner, smellier and more like adult stools. See Starting Solid Foods for more information.

Further reading

For a more in depth review of all the possible colours of baby poop and what they mean see Baby Poop: What Your Pediatrician May Not Tell You. For a review of the content of this book click here.

Summary

The contents of your baby’s nappy can provide useful information about breast milk intake and your baby’s health alongside other signs that your baby is receiving plenty of milk. See Is My Baby Getting Enough Milk? and Baby Not Gaining Weight if you have any worries about how much breast milk your baby is having and seek the help of an IBCLC lactation consultant or breastfeeding specialist. Always report unusual colours of poop to your health professionals.

*Excerpts reprinted by permission of Pinter and Martin

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