4 Month Old Sleep Schedule: Naps, Bedtime & Surviving the 4-Month Regression

If you’ve hit the four-month mark and sleep suddenly feels like it’s all over the place, your baby is very likely going through a milestone. Naps that used to be predictable are now short and scattered, night wakings are more frequent, and a baby who used to settle easily is suddenly fussing to be put down.

This is the 4-month sleep regression, and it’s one of the most universal (and most disruptive) stages in a baby’s first year.

The reassuring part is that it’s something you just need to wait out. It’s a permanent shift in how your baby’s brain organises sleep. Once you understand what’s happening, it’s a lot easier to build a schedule that works with it.

How Much Sleep Does a 4 Month Old Need?

Most 4-month-olds need around 15–15.5 hours of sleep across a 24-hour day — roughly 12 hours overnight and 3–4 hours spread across daytime naps.

4-Month-Old Wake Windows

Wake windows at this age are shorter than many parents expect: about 1.5–2 hours between sleeps. Generally speaking, the first wake window of the day is usually the shortest, and each one after that stretches a little longer, with the last stretch before bedtime reaching close to 2 hours.

Sample 4-Month-Old Bedtime and Nap Schedule

Here’s a realistic starting point for a 4 month old bedtime and nap schedule with three to four naps:

Time	Activity
7:00 AM	Wake and first feed
8:30 AM	Nap 1
9:15–9:30 AM	Wake, feed
11:00 AM	Nap 2
11:45 AM–12:00 PM	Wake, feed
1:45 PM	Nap 3
2.30-2:45 PM	Wake, feed
5:00 PM	Nap 4 (often shorter)
5:30 PM	Wake, feed
7:00–7:30 PM	Bedtime routine begins
7:30–8:00 PM	Asleep

Nap length is often short and inconsistent at four months — 30 to 45 minutes is completely normal, even if it feels like it should be longer by now. That’s a sign your baby’s sleep cycles are still maturing.

Remember, this is just to help you picture what a 4-month-old sleep rhythm looks like. The most reliable cues are your baby’s sleep cues, such as rubbing of the eyes, scratching of the ears, staring into space, and avoiding eye contact. First yawns are not accurate sleepy cues.

The 4-Month Sleep Regression, Explained

Around four months, your baby’s sleep architecture permanently shifts from newborn-style sleep into adult-like sleep cycles, complete with lighter and deeper stages. This is a genuine neurological milestone — it’s not temporary in the sense of “wait a week and it’ll go back to how it was”.

What would help your baby now is to help them learn how to move through these new sleep cycles, including linking one cycle to the next without fully waking up.

Common signs of the 4-month regression include:

• More frequent night wakings, even in babies who were previously sleeping longer stretches

• Naps that suddenly get shorter or harder to settle into

• New resistance to the cot or bassinet that wasn’t there before

• Increased fussiness around sleep times in general

If this is hitting your family hard, you are far from alone. This is often the point where parents start seriously looking into sleep schedules, routines, and self-settling for the first time.

What Can Help During the Transition

A few things tend to make this stage more manageable:

• Keeping wake windows consistent, even when naps themselves are unpredictable, gives your baby’s body more cues about when sleep is coming.

• Try not to put them down undertired; I see this too often when parents come to work with us.

• A simple, repeatable pre-nap and pre-bedtime routine (even just 5–10 minutes) helps signal that sleep is next.

• Give your baby more floor time to practice new motor skills, as this helps increase sleep pressure. The higher the sleep pressure, the easier they fall asleep.

• Adjusting expectations. This stage doesn’t resolve overnight. Small, steady changes tend to work better for most babies.

If you’re navigating this at 4.5 months, our 5-month-old guide can help you see what’s ahead.

If the 4-month regression has you stuck, you don’t have to figure it out alone. A sleep consultant can help you build a plan around what your baby’s going through right now.

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