Wet nappy count is the single most reliable signal that your baby is feeding well. Here's how to use it.
Forget the clock. Forget exact ml counts. The most reliable, accessible signal that your baby is feeding well is how often they're peeing.
Why pee matters more than you think
A baby that's getting enough milk produces enough urine. A baby that isn't, doesn't. It's that direct.
Pediatricians ask about wet nappies at every early checkup because it's:
- A measurable proxy for fluid intake
- An early warning for dehydration
- Hard to fake (the nappy doesn't lie)
How many wet nappies is "enough"?
| Age | Wet nappies / day |
|---|---|
| Day 1 | 1 |
| Day 2 | 2 |
| Day 3 | 3 |
| Day 4 | 4–5 |
| Day 5 onward | 6+ |
| 1 month onward | 6+ consistently |
A "wet" nappy in the early days might be subtle. By day 5, you should be feeling actual weight when you pick up a used one.
A trick if you're not sure: pour 3 tablespoons of water into a clean nappy. That's roughly what a heavy wet nappy feels like.
What healthy urine looks like
- Pale yellow to nearly clear — well hydrated
- Strong yellow — could be slightly under-hydrated, but in a small baby, sometimes just normal first-of-the-day
- Dark yellow or amber — likely under-hydrated; check with your doctor if it persists
- Pink/orange "brick dust" — common in the first 2–3 days, harmless. Persistent pink staining after day 4 needs a call.
Diapers vs cloth
Disposable nappies absorb so well that "wet" can be hard to tell. A few tricks:
- Pick it up — a wet disposable feels noticeably heavier
- Press gently — does it feel squishy?
- Use the wetness indicator stripe if your nappies have one
Cloth nappies are the easier read. You'll know.
When to call your pediatrician
Call promptly if you see:
- Fewer than 6 wet nappies a day after day 5
- Dry nappies for 8+ hours in a young baby
- Sunken fontanelle (the soft spot on the head)
- Lethargy, fewer tears when crying, dry mouth
- Persistent dark or pink-tinged urine after day 4
Dehydration in a small baby moves fast. Trust your instincts.
Track wet nappies, not just feeds
Logging feeds tells you what went in. Logging wet nappies tells you what's coming out — which is the better signal.