Brown, tan, yellow and green are all normal. The only three colors that mean call are red, black and white. That is the entire list, and it is worth learning now rather than at 2am with a phone torch.
Nobody warns you how much of the first month is spent staring into a diaper trying to work out whether what you are looking at is fine.
The first week is a color parade
The opening act is meconium. The American Academy of Pediatrics describes it as a thick black or dark green substance that filled your baby’s intestines before birth, and it turns up for the first few days.
It is tar. It does not wipe off so much as relocate. Nobody tells you this part, and the first one arrives while you are still fairly convinced you are not qualified to be holding this baby.
Then it turns. The AAP says that once meconium passes, stools go yellow green, and after that it depends on what your baby is drinking. Breastfed babies produce yellow liquid with particles the AAP says remind many parents of little seeds, ranging from very soft to loose and runny. Formula fed babies land at tan or yellow, firmer, but the AAP is specific here: no firmer than soft clay.
By the end of week one you are somewhere in the normal range, and the normal range is enormous.
The green panic
Green is the one that sends people to a search bar, and it is a false alarm every time.
The AAP’s own symptom guidance says it twice, in two different places, which tells you how often they get asked. Green stools are always normal. Most dark green comes from bile. Green is more common in formula fed babies but happens with both, and it turns up more with a fast transit through the gut.
Green is not on the list. It has never been on the list.
The three that mean call
White or light gray. The AAP says babies with blocked bile ducts have stools that are light gray or pale yellow, and its threshold for calling is light gray or white occurring two or more times. This one does not get watched and waited on.
Black, after the meconium days are over. Black is expected at the start. Once you are into yellow or tan, it should not come back. The AAP explains why: stomach acid turns blood a dark, tar-like color, so black later can mean bleeding higher up.
Red. Worth a call, though here the AAP offers a genuinely calming statistic. Ninety percent of red stools are not caused by blood. Red medicines are a common culprit. Still a call, but not a 3am emergency in most cases.
The AAP also flags calling promptly for large amounts of blood, mucus or water in the stool, and for a strange color with no explanation lasting more than 24 hours, with green explicitly exempted from that rule.
The trick for telling black from dark green
This is the most practically useful thing on this page and almost nobody publishes it.
Dark green looks black in a badly lit room, and at 3am every room is a badly lit room. The AAP’s instruction is direct: smear a piece of stool on white paper and look at it under a bright light. That usually settles it on the spot.
It sounds absurd until the night you need it. Kitchen roll and the overhead light will answer in ten seconds a question that would otherwise cost you an hour of scrolling and a phone call you were not sure you were entitled to make.
Two things you will see and misread
Both of these are normal and both look like blood, which is a poor combination at week one.
The pink or brick red stain. The AAP says you may see this in the first week and that it is often mistaken for blood, when it is usually just very concentrated urine. As long as your baby is wetting at least four diapers a day there is probably nothing to worry about. If it keeps going, ask.
A small spot of blood in a newborn girl’s diaper. Also usually in the first week, and the AAP explains it as the birth parent’s hormones affecting the baby’s uterus. After that first week, though, actual blood is never normal and your pediatrician should be told.
How often is this supposed to happen
The range is wide enough to be unhelpful, which is itself the point.
On the wet side, the AAP says newborns may urinate as often as every one to three hours, or as infrequently as four to six times a day. Both ends are normal.
On the other side, breastfed babies often go after nearly every feed in the early weeks, which lines up with how often they are feeding. If your evenings have turned into one continuous feed, our post on cluster feeding covers what that is.
Then somewhere around six weeks many breastfed babies slow right down, sometimes going days. If the baby is comfortable, feeding, gaining and producing wet diapers, that can be entirely normal, and it will still feel like something has broken.
One more, because it catches people out: the AAP notes that supplemental iron can turn stools dark brown. If your baby has started iron, that is the explanation. Our post on iron for breastfed babies covers when that starts.
Ignore the color charts
Search this and you will find a wheel of twelve shades with a condition attached to each one. Most of it is invented precision. The AAP’s version fits in one line: the only colors that may relate to disease are red, black and white.
You will also get faster at this than you expect. The diaper that has you googling in week one is completely unremarkable by week six, and you will not notice the moment it stopped being frightening.
Until then, if something looks wrong and you cannot shake it, call. Pediatric offices field this exact question constantly and nobody there thinks it is a silly one.
The short version
- Normal: any shade of brown, tan, yellow or green. Green is always normal.
- Call: red, black after the meconium days, or white and light gray twice or more.
- Dark green looks black in bad light. Smear it on white paper under a bright light.
- A pink or brick red stain in week one is usually concentrated urine, not blood.
- A spot of blood in a newborn girl’s diaper in week one is usually maternal hormones. After that week, blood is never normal.
- Iron supplements turn stools dark brown.
Sources
- American Academy of Pediatrics, HealthyChildren.org, “Baby’s First Days: Bowel Movements and Urination”
- American Academy of Pediatrics, HealthyChildren.org, Symptom Checker, “Stools – Unusual Color”
A note on this post. Written and edited by the NewBloom editorial team. NewBloom is not written by doctors, nurses or midwives, and nothing here is medical advice. We read the current guidance from bodies like the AAP, the CDC and the NHS and write down what it says, with every claim traced to its source and named in the sentence where it appears. General guidance is not the same as an answer about your baby. Your pediatrician, midwife or health visitor can see your child and we cannot, so anything here that raises a question about your own baby is a reason to ask them. If something is wrong right now, contact your doctor or your local emergency number. More about how we write these posts.