Nappy contents are one of the most reliable indicators of how your newborn is feeding and growing — and almost nothing in new parent preparation explains what you're actually going to find. Here's the guide.
In the first 24 to 48 hours, your baby's nappies will contain meconium — a dark, greenish-black, sticky substance that looks nothing like what comes afterwards. Meconium consists of everything ingested in the womb: amniotic fluid, mucus, bile, and shed cells. It has no smell and a tar-like consistency that takes some effort to clean.
Your baby should pass meconium within the first 24 hours of life. If they haven't, let your midwife know. In rare cases, delayed meconium can indicate a bowel condition. Meconium in the amniotic fluid before birth (meconium-stained liquor) is a separate concern that your birth team will assess — it can sometimes indicate the baby was under stress during labour.
Nappy colour follows a predictable progression in the first week that tells you how feeding is going:
Days 1–2: Black or greenish-black meconium.
Days 3–4: Transitional stools — greenish-brown or khaki as milk replaces meconium.
Days 4–5+: Yellow mustard in breastfed babies; paler yellow, beige, or tan in formula-fed babies.
If your baby is still passing dark green or black stools on day 5, it may mean they haven't been feeding effectively and aren't receiving enough milk. Tell your midwife if nappies aren't following this progression. It's one of the first questions a midwife will ask.
This surprises most parents because it's rarely mentioned in advance. Breastfed babies produce yellow, mustardy, often seedy-looking stools that can be quite loose — even watery. This is normal and is not diarrhoea. Breastfed stools also have a mild, almost inoffensive smell, because breast milk is so efficiently digested.
Formula-fed nappies are firmer, more formed, and paler — often light tan or beige — with a more pronounced smell. If you switch from breastfeeding to formula or combine both, expect a noticeable change in nappy contents.
Colours that should prompt contact with your midwife: white or chalky (possible bile duct concern), red or bloody, or black after day 4 (different from meconium, needs investigation).
There is no 'normal' number of dirty nappies per day. Breastfed babies in the first weeks can produce 8 or more dirty nappies daily — because breast milk stimulates frequent bowel movements. Formula-fed babies poo less often from the start.
After around 6 to 8 weeks, some breastfed babies switch to pooing once every few days — or even once a week. This is entirely normal as long as stools remain soft and easy to pass when they do come. Constipation in breastfed babies is uncommon. Formula-fed babies are more prone to it; signs to watch for are hard, pellet-like stools and clear discomfort during passing.
In the first days, before milk comes in, the number of wet nappies is the clearest indicator of whether your baby is getting enough colostrum. The rule: one wet nappy on day 1, two on day 2, three on day 3 — building to 6 to 8 heavy wet nappies per day from day 5 onwards.
Once milk is established, 6 to 8 heavy wet nappies — where the nappy feels distinctly weighty and urine is pale — is the target. Very dark, concentrated, or orange-tinted urine (sometimes called 'brick dust' in newborns) indicates dehydration and should be mentioned to your midwife promptly. In the first days, brick dust alongside low wet nappy counts is a sign that feeding needs review.