The third nap is the one that stops making sense. It gets shorter, then it gets refused, then it pushes bedtime so late that the whole evening goes wrong. Dropping it is usually the right call — but only once you can tell a real transition from a bad fortnight.
When it happens, and how firm that age is
In the cohort data, a pattern of two naps a day is well established by nine to twelve months.[1] The drop from three usually happens somewhere before that, most commonly between six and nine months. That is a description of what children do, not a schedule anyone should hit — the same study found the number of naps falls with age at a correlation of about −0.5, which is a real trend and a very loose one.
9–12 months
One finding is worth holding on to: total daytime sleep is a stable individual characteristic between six and eighteen months.[1] A baby who has always napped generously stays that way through the transition, and a baby who never has will not suddenly start. Compare your baby with themselves last month, not with the baby in the group chat.
The signs that actually mean it
- The third nap is refused outright, or takes 20 minutes of settling for a 15-minute nap.
- It happens so late that bedtime is pushed past its usual time, and the night gets worse rather than better.
- The first two naps have lengthened on their own — the day is consolidating.
- Your baby can hold a longer window before the first nap without falling apart.
Signs that mean something else
Almost everything that looks like a nap transition in a single week is not one. Teething, a cold, a new skill being practised at 5am, a holiday, a nursery start, and the ordinary 8–10 month burst of motor development all wreck naps for a while and then stop. So does a window that has quietly become too short for a baby who now needs more awake time.
How to make the move
Give it one to two weeks. The aim is a day with two solid naps, not two naps in the same places as before.
- 1
Stretch the first window a little
Add 10–15 minutes before the first nap every few days. That first window is what makes room for the rest of the day.
- 2
Push the second nap later
Aim for a second nap that starts early afternoon and is the longer of the two. The morning nap gradually becomes the shorter one.
- 3
Cap the morning nap if it eats the afternoon
If the morning nap runs long and the afternoon one collapses, wake your baby from the morning nap at around an hour.
- 4
Move bedtime earlier — properly earlier
On two naps the last window is doing far more work. An earlier bedtime is not a treat during this transition, it is the mechanism that stops the whole thing falling apart.
- 5
Keep one bridge nap in reserve
On the days it fails, a short late nap in the pram or the carrier — then an earlier bedtime anyway — is better than pushing an exhausted baby to bedtime on principle.
What the day looks like before and after
| On three naps | On two naps | |
|---|---|---|
| Wake | 07:00 | 07:00 |
| Nap 1 | 08:45–09:45 | 09:15–10:15 |
| Nap 2 | 12:30–13:30 | 13:00–14:30 |
| Nap 3 | 16:00–16:30 | — |
| Bedtime | 19:30 | 18:45–19:00 |
Note where the slack goes: the last window is the longest of the day, which is the same principle behind wake window stacking. If you would rather work from your own baby's ages and times than from an example, the wake window calculator will do the arithmetic.
How long the messy part lasts
Usually one to two weeks, with a handful of days in the middle where two naps are clearly not enough and three no longer fit. Those are early-bedtime days. Expect it to look like it is not working around day four; that is normally the point at which it starts to.
Judge it on the 24-hour total
The nap count is a means, not the goal. What matters is the total across the day and night: the AASM consensus recommends 12–16 hours per 24 hours for infants aged 4–12 months, including naps, and says nothing about how that total should be divided.[3] If your baby is landing in that range, waking cheerful and making it through their windows, the transition is working even on a day the schedule looks nothing like the table above.[5]
It is worth knowing how thin the evidence is under all nap advice. A systematic review of napping and child development from birth to five years found 26 studies, all observational and all graded low quality.[4] Nap counts by age come from cohorts describing what children did, not from trials showing what works — which is exactly why your own baby's pattern beats any published schedule.
