Red flags — seek medical review if:
- No wet nappy in 8 hours, or nappies feel only slightly damp rather than heavy, especially from day 5 onward.
- Stool remains dark (black or dark green) beyond the first few days, or stool is pale, white, or chalky at any age.
- Blood is seen in stool or vomit.
- Nappy output is dropping day on day rather than rising, alongside a sleepy or hard-to-wake baby.
If your baby has a fever, remember: fever of 38°C or more in a baby under 3 months is an emergency — do not give paracetamol and wait; seek urgent medical care.
Why nappies tell a feeding story
A newborn cannot tell you whether they are getting enough milk, but their nappies can give a strong daily clue. What goes into a baby has to come out, and the number and character of wet and dirty nappies broadly track how much milk the baby is taking in and how well the gut is processing it. Because milk supply and stomach capacity increase gradually over the first week of life, the "right" number of nappies increases day by day too — which is the idea behind counting output against the baby's age in days rather than expecting adult-like consistency from day one.
The general day-by-day pattern
As a rough guide that rises with the baby's age:
- Day 1: at least one wet and one dirty nappy, often dark, tar-like (meconium) stool.
- Days 2–3: wet nappies increase; stool colour usually starts transitioning from black-green toward a lighter, greenish-brown.
- Days 4–5 onward: stool typically becomes yellow, seedy, and looser if breastfed, or a slightly firmer yellow-brown if formula fed; wet nappies become reliably frequent.
- From around day 5–6 onward: most babies should be producing several substantially wet nappies and several stools every 24 hours, broadly matching how well feeding has become established by that point.
By roughly the fifth day of life, a baby who is feeding well is generally expected to be producing noticeably wet, heavy nappies regularly and passing yellow, soft stool — this shift by day five is often used as a simple checkpoint that feeding has "switched on" properly. A wet nappy should feel distinctly heavy, not just damp; some parents find it useful to compare against a nappy with a known small amount of water added, to get a feel for what "properly wet" means.
What to do
Keep a simple log for the first couple of weeks — a tally on paper or an app is enough — because a log is far more reliable than memory when everyone is sleep-deprived. Bring this log to weight checks; it gives your midwife or health visitor useful context alongside the scale. If output ever seems to drop rather than rise as the days go on, treat that as a prompt to seek a feeding review rather than waiting to see if it improves alone.
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Message us on WhatsAppClinical thresholds in this page were reviewed and signed off by Dr Didier Decamps on 17 August 2026. This is general information and does not replace an individual assessment by a qualified clinician.
Written with AI assistance. Reviewed, corrected and signed by Dr Didier Decamps, paediatrician.
Last reviewed: 17 August 2026