Ranges, not deadlines. Nap transitions are gradual and messy. A baby is usually in the middle of one for several weeks, taking the old number of naps some days and the new number on others.
Dropping a nap is not a single event. It is a stretch of weeks where your baby is genuinely between two schedules — too awake for the old one, not quite ready for the new one. Knowing which transition you are in, and roughly how long it lasts, makes the messy weeks much easier to read.
The four nap transitions
| Transition | Typical age | Wake window before | Wake window after |
|---|---|---|---|
| 4 → 3 naps | 3.5–5.5 months | ~1h50 | ~2h10 |
| 3 → 2 naps | 6–9 months | ~2h30 | ~3h00 |
| 2 → 1 nap | 13–18 months | ~3h30 | ~4h30 |
| 1 → 0 naps | 30–42 months | ~5h45 | ~6h30 |
The wake window has to lengthen before the nap can be dropped — that is the whole mechanism. If the windows do not stretch, removing a nap just creates an overtired baby.
Signs a transition has started
- Your baby takes 30–45 minutes to fall asleep for a nap that used to be instant
- One nap is consistently refused — often the last one of the day
- Bedtime starts drifting later and later, or bedtime resistance appears out of nowhere
- Early morning wakings begin (a classic sign of a nap schedule that no longer fits)
- Night wakings return in a baby who had been sleeping through
Crucially, all of these are also signs of a regression, teething, or illness. What points to a transition is the age, plus the pattern repeating for more than a week.
During a transition, the honest answer is “it depends on the day.” NapNap knows when your baby is in a nap transition and shows you both predictions — the old schedule and the new one — so you can pick based on how the day has actually gone.
Get the app free →Free to try · No account needed · Works offline
4 to 3 naps (3.5–5.5 months)
The shortest and easiest transition. The late-afternoon catnap gets refused or shrinks to 15 minutes. Wake windows stretch from about 1h50 to 2h10.
How to handle it: keep the catnap as long as your baby will take it, even a 20-minute one, because dropping it too early pushes bedtime into overtired territory. Once it is genuinely refused for a week, drop it and move bedtime 20–30 minutes earlier.
3 to 2 naps (6–9 months)
Wake windows stretch from about 2h30 to 3h00 and the third nap goes. The two remaining naps usually lengthen to compensate, with the midday nap becoming the long one.
How to handle it: alternate. On days the third nap happens, keep bedtime normal. On days it does not, bring bedtime forward by 30–45 minutes. Expect four to six weeks of alternating before it settles.
2 to 1 nap (13–18 months)
The hardest one, and the one most often attempted too early. Wake windows jump from about 3h30 to 4h30 — a big ask. Many toddlers refuse the morning nap for a few days, get overtired, then go back to needing two for another month.
How to handle it: do not go straight to one nap. Push the morning nap later in 15-minute steps across two to three weeks, until it lands around 11:30–12:00 and becomes the only nap. Offer an early bedtime (as early as 6:00pm) on the days the single nap is short. Expect four to eight weeks.
Do not drop the second nap because of a bad week. Illness, teething and travel all cause temporary nap refusal at this age. If nap refusal stops the moment the illness resolves, it was not the transition.
1 to 0 naps (30–42 months)
Very variable — some children stop napping before three, others still nap at four. Wake windows stretch to around 6h30.
How to handle it: replace the nap with a protected quiet time in the bedroom, and move bedtime earlier by 30–60 minutes. Many children need a nap on some days for months after they stop needing one daily. If a nap makes bedtime impossible but no nap makes late afternoon unbearable, quiet time plus a 6:30pm bedtime is usually the answer.
The rules that apply to all four
- Lengthen the wake windows first. The transition is caused by longer windows, not the other way round.
- Go gradually. Push the nap later in 15-minute steps rather than dropping it overnight.
- Use an early bedtime as the safety valve. On short-nap days, bedtime moves earlier. This is the single most useful tool you have.
- Expect weeks, not days. Four to eight weeks is normal for the bigger transitions.
- Alternating days is not failure. It is what a transition looks like.
If you are unsure whether you are in a transition or something else, compare your baby’s current sleep against the typical totals for their age and their wake windows first.
Common questions
When do babies drop to one nap?
Usually between 13 and 18 months, though some toddlers hold on to two naps until closer to 18 months. Doing it before about 12 months almost always creates overtiredness, because the wake windows are not long enough yet to support a single nap.
How long does a nap transition take?
The 4-to-3 transition often takes a week or two. The 3-to-2 and 2-to-1 transitions typically take four to eight weeks, with days alternating between the old and the new schedule.
My baby is refusing a nap. Should I drop it?
Not on the basis of a few days. Illness, teething, travel and developmental leaps all cause temporary nap refusal. Look for consistent refusal over at least one to two weeks, at an age that matches a known transition, before dropping a nap.
What do I do on days the nap is too short?
Move bedtime earlier, by anywhere from 30 to 60 minutes. An early bedtime is the main tool for absorbing a short nap without letting overtiredness build into the night.
Do nap transitions cause night wakings?
Yes, frequently. A schedule that no longer fits produces overtiredness, and overtiredness fragments night sleep and causes early morning wakings. If night sleep deteriorates around a transition age, the daytime schedule is usually the first thing to check.