Four months is one of the most significant sleep milestones of the first year — and often the most challenging. The 4-month sleep regression hits right around now as your baby's sleep architecture permanently matures into adult-like cycles. Naps may shorten, nighttime waking may increase, and your previously "good sleeper" may suddenly seem unable to settle. This is developmental, not a problem to fix. For a complete overview of how this fits into the first year, see our complete baby sleep schedule by age.
💡 4 Months Sleep at a Glance
Total sleep: 12–15 hours per day
Naps: 3–4 naps
Wake windows: 90–120 min between sleeps
Nighttime: May fragment due to regression
A 4-month-old needs 12–15 hours of total sleep per day across 3–4 naps. Wake windows are stretching to 90–120 minutes. However, the 4-month sleep regression often disrupts what was working — naps may cap at 30–45 minutes and nighttime waking may increase significantly. This is a neurological milestone, not regression from prior good habits.
⚠️ 4-Month Sleep Regression
The 4-month sleep regression hits right around now. It's a permanent and healthy change in your baby's sleep architecture — not something you did wrong. Most families see improvement within 2–6 weeks. Learn more about the 4-month regression →
The following sample schedules are starting points — adjust based on your baby's natural wake time and how long each nap runs. Watch cues, not just the clock.
| Time | Activity | Notes |
|---|---|---|
| 6:30 AM | Wake & Feed | Morning wake |
| 8:00 AM | Nap 1 | After 90 min |
| 9:30 AM | Wake & Feed | Nap may be short — 30–45 min |
| 11:15 AM | Nap 2 | After ~105 min |
| 12:45 PM | Wake & Feed | Midday |
| 2:30 PM | Nap 3 | After ~105 min |
| 4:00 PM | Wake | Afternoon wake |
| 5:30 PM | Nap 4 (catnap, if needed) | 30 min only |
| 6:00 PM | Wake | Brief before bedtime |
| 7:00 PM | Bedtime Routine | Bath, feed, dark room, white noise |
| 7:30 PM | Down for night | Regression: may wake multiple times |
| 11:00 PM | Night wake (regression) | Offer comfort/feed if needed |
| 2:00 AM | Night wake (regression) | Normal during regression |
| 4:30 AM | Night wake / early feed | Normal during regression |
| Time | Activity | Notes |
|---|---|---|
| 7:00 AM | Wake & Feed | Start of day |
| 8:30 AM | Nap 1 | After 90 min |
| 10:00 AM | Wake & Feed | Often a short 30 min nap |
| 11:45 AM | Nap 2 | After ~105 min |
| 1:15 PM | Wake & Feed | Midday |
| 3:00 PM | Nap 3 | After ~105 min |
| 4:30 PM | Wake | Afternoon |
| 5:45 PM | Catnap (optional) | If gap to bedtime is too long |
| 7:30 PM | Bedtime | Feed, drowsy-but-awake |
| 11:30 PM | Night wake | Regression wake |
| 3:00 AM | Night wake | Regression wake |
A wake window is the period of time a baby can comfortably stay awake between sleeps. At 4 months, the ideal window is 90–120 min. Keeping wake windows consistent is one of the most effective tools for improving nap quality and nighttime sleep.
✓ The Goal: Drowsy But Awake
Aim to put baby down when they are drowsy but still awake. This gives them the opportunity to practice the last step of falling asleep independently — the same skill they'll need when they rouse between sleep cycles at night.
This is the #1 issue at 4 months. Caused by permanent maturation of sleep architecture, it means your baby now cycles through light sleep and wakes fully between cycles. This is normal and temporary — most families see improvement in 2–6 weeks.
Short naps are the hallmark of the 4-month regression. Your baby is waking at the end of one sleep cycle. Try re-settling with a hand on chest or gentle shush — some babies can be guided back into a second cycle.
Multiple night wakings during the regression are typical. Maintain consistency in how you respond, and try to put baby down drowsy-but-awake to encourage self-settling.
Some babies actually need slightly shorter wake windows during the regression — watch cues closely and don't push past 90–100 min if baby seems tired earlier.
A consistent sleep environment is one of the most powerful tools for improving nap length and quality. Even if you can't control timing perfectly, you can always control the sleep space.
No schedule is permanent — as your baby grows, wake windows lengthen and nap count decreases. Signs it may be time to adjust:
When adjusting, change one thing at a time and give 5–7 days for your baby to adapt before making further changes.
How many naps does a 4-month-old need?
A 4-month-old typically needs 3–4 naps per day. During the 4-month sleep regression, naps may shorten to 30–45 minutes each. Total sleep is 12–15 hours in 24 hours.
What are wake windows for a 4-month-old?
Wake windows at 4 months are 90–120 minutes. During the regression, some babies do better with slightly shorter windows (80–90 min). Watch for tired cues rather than rigidly following the clock.
What time should a 4-month-old nap?
A typical 4-month nap schedule with a 7 AM wake time: Nap 1 around 8:30 AM, Nap 2 around 11:30 AM, Nap 3 around 2:30 PM, and bedtime around 7:00–7:30 PM.
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