Wake windows for a 3-month-old
A 3-month-old can usually stay awake 1 hr 10 min – 2 hr between sleeps. Rytmi starts from 1 hr 35 min, then learns your baby’s own rhythm from a few days of logs.
When to put your baby down next
Wake window — usually —
Next nap around — usually —
Calculated right in your browser. Nothing is sent or saved.
At 3 months
| Starting point | Usual range | |
|---|---|---|
| Wake window | 1 hr 35 min | 1 hr 10 min – 2 hr |
| Next nap after waking at 7:00 AM | 8:35 AM | 8:10 AM – 9:00 AM |
| Time between feeds | 3 hr | 2 hr 5 min – 3 hr 55 min |
| Bedtime | 8:30 PM | 7:35 PM – 9:25 PM |
What changes at this age
At three months many babies settle into a more recognizable day: the first nap of the morning often lands at a similar time, and the stretch before bedtime gets longer.
The evening is where a window most often runs long. If the last stretch before bed ends in tears, look at how long your baby was actually awake — the answer is easier to see in a log than in memory.
From about 4 months, Rytmi starts from 2 hr 5 min.
Signs the window is closing
Playing more slowly than usual, rubbing their eyes, turning away, fussing for no clear reason — the window is closing, even if the numbers say there is time left. It works the other way as well: an alert, busy baby doesn’t have to fall asleep on schedule.
Where these numbers come from
These are the age-based starting points Rytmi uses until your baby has a history of their own. Once there are enough entries, the app works from your baby instead: their own wake windows, their own bedtime, their own time between feeds.
- They are not medical norms and not a diagnosis
- The middle of the range is a guide, not a target
- Your baby’s own rhythm beats any chart
Read next
Short naps: why they happen and what helps
Wake windows by age
Newborn · 2 months · 3 months · 4 months · 5 months · 6 months · 8 months · 9 months · All ages
Rytmi does the math for you
Log a few naps and feeds, and the app starts showing your baby’s own wake windows instead of averages.
Rytmi is on iPhone for now. The Android app isn’t on Google Play yet.
For iPhone · free · no ads
The ranges on this page are for planning the day and are not medical advice. For questions about your child’s health, sleep and development, talk to your pediatrician.