Guides · Sleep schedule
4 Month Old Sleep Schedule
Four months is a pivotal sleep age. Your baby's sleep architecture matures into adult-like cycles (the famous 4-month sleep regression), wake windows stretch to 90–120 minutes, and the day rhythm becomes much more predictable. This is the age where a structured schedule — anchored to wake windows rather than rigid clock times — starts to genuinely help. Most 4-month-olds take 3–4 naps and sleep 12–15 hours total.
Sleep schedule · data from paediatric sleep guidelinesWake windows, naps and total sleep
At this age your baby can comfortably stay awake for 1h 30m–2h between sleeps. Most 4 month babies take 3–4 naps a day and sleep 12–15 hours (day naps + night sleep). Use the wake window — not the clock — as your main signal for when the next sleep is due.
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Illustrative rhythm — every baby varies. Use wake windows rather than the clock to time sleep.
| Time | What happens |
|---|---|
| 7:00 AM | Wake, feed |
| 8:45–10:00 AM | Nap 1 |
| 10:00 AM | Wake, feed |
| 11:45 AM–1:00 PM | Nap 2 |
| 1:00 PM | Wake, feed |
| 2:45–4:00 PM | Nap 3 |
| 4:00 PM | Wake, feed |
| 5:45–6:15 PM | Catnap (4th, optional, often dropping) |
| 7:00 PM | Bedtime routine, feed, sleep |
| Night | 10–11h; 1–2 night feeds |
Bedtime routine
A predictable bedtime routine cues your baby that sleep is coming and makes settling easier. At this age, aim for a calm 20–30 minute wind-down in the same order every night. A simple sequence:
- Bath or wash — warm water lowers body temperature, a natural sleep signal.
- Feed — milk in a dim, quiet room; burp well before lying down.
- Book or song — two short books or one familiar lullaby.
- Swaddle or sleeping bag — a clear "sleep time" cue.
- Into the crib calm — use a settling approach that is safe and workable for your family.
Lay your baby down using the settling approach that works for your family. Respond as needed, and see our fuller bedtime routine guide for age-by-age variations.
Common sleep challenges at this age
- The 4-month sleep regression. Around 3.5–4.5 months your baby's sleep permanently changes to lighter, more adult-like cycles. They may wake every 1–2 hours at night and nap poorly for 2–6 weeks. This is developmental, not a step backwards — consistent routines and putting them down drowsy but awake help them learn to connect sleep cycles.
- Catnap dropping. The late-afternoon 4th nap becomes harder to achieve as wake windows lengthen. Most babies drop it between 4 and 6 months, moving bedtime 15–30 minutes earlier to bridge the gap.
- Short naps. If naps are still 30–45 minutes, the cause is often an undertired or overtired baby. Aim for wake windows of 90–120 minutes — both too-short and too-long wake times fragment naps.
Frequently asked questions
What is the wake window for a 4-month-old?
90–120 minutes between sleeps. By 4.5 months some babies reach 2–2.25 hours. The window grows quickly at this age — adjust every couple of weeks to avoid an undertired baby.
How many naps does a 4-month-old need?
Usually 3–4. The 4th is a short late-afternoon catnap and is actively dropping. By 5–6 months most babies are firmly on 3 naps.
Why did my 4-month-old start waking at night?
This is the 4-month sleep regression: a permanent change in sleep architecture that surfaces between 3.5 and 4.5 months. Your baby is learning to cycle between light and deep sleep. Consistent routines, full daytime feeds, and settling them drowsy but awake help them learn to link sleep cycles.
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This schedule is a general guide based on paediatric sleep consensus, not medical advice. Every baby is different. For persistent sleep problems, breathing pauses during sleep, or anything that worries you, talk to your pediatrician.