Baby Tracker for DadsHow many hours without a wet diaper is too long for a baby?
If your baby has had no wet diaper in 8 hours, or far fewer than usual, call your pediatrician right away. The AAP gives the 8-hour line, the NHS urgent-help page uses 12 hours, and the NHS lists fewer wet nappies than usual as a sign of dehydration.
Call your pediatrician right away (UK: your GP or NHS 111) if your baby:
- No urine
| Sign | Threshold | Action | Source |
|---|---|---|---|
| No urine | More than 8 hours | Call your pediatrician right away | AAP |
| Has not had a pee | 12 hours | Get urgent help (UK) | NHS |
| Fewer wet nappies than usual | Any drop you notice | A sign of dehydration; get advice (UK: 111 or your GP) | NHS |
What the sources say
No urine in more than 8 hours
has not had a pee in the past 12 hours
fewer wet nappies than usual
At 3 AM
Count wet diapers, not changes. A diaper changed at 2 AM that was dry is a change, not a wet diaper. If you cannot tell whether a disposable is wet, the wetness strip on the front changes colour; with cloth, go by weight.
What counts as usual is your baby's own number. The NHS says fewer than usual rather than giving one count for everyone, and your own log is what usual means.
Feeds and wet diapers travel together. If the diapers have dropped off, look at how the feeds have been; a baby who takes very little for 8 hours has a line of its own.
Have these ready: the baby's age in weeks, the time of the last wet diaper, how many in the last 24 hours and what is usual, feeds in the same window, any vomiting or diarrhoea, any fever, and whether the baby seems as alert as usual.
If you take turns, hand over the count. When one of you does the late diaper and the other the early one, the gap that matters crosses the handover, and one shared log is the only way either of you sees the whole 8 hours.
Where the sources differ
The AAP's line is 8 hours without urine. The NHS urgent-help page uses a longer line, 12 hours without a pee, and the NHS dehydration page describes the sign as fewer wet nappies than usual. Where the sources differ, the earlier action is used, so this page says 8, as the app does.
You know your baby best. If you think something is seriously wrong, get help now.
This page is general information, not medical advice. If you're worried, call your pediatrician.
Related questions
Baby Tracker for Dads counts today's wet diapers for you and keeps this line on its free When to call a doctor page.