4 Month Sleep Regressions, Signs & Tips
By Robynn Yip, Certified Gentle Sleep Coach®
If your child's sleep schedules are suddenly turning upside down—suddenly waking up every hour in the night, fighting bedtime, and getting extra clingy and fussy and skipping naps they used to love—chances are that it could be a developmental leap. While it is often labeled as “sleep regressions”, we should really shed a positive light on it. These bumps in the road are inevitable, and developmentally normal, as they often coincide with big developmental growth spurts and the acquisition of major skills. As they explore rolling, and later on crawling, walking, and babbling, sleep often gets disrupted due to heightened brain activity that occurs in the day and in the night. It usually settles down in 2–6 weeks if you stay consistent and patient, but sleep struggles can also persist after your baby’s developmental leaps.
The Infamous 4-Month Sleep Regression
As your baby shifts from the newborn stage to having more predictable sleep stretches as their circadian rhythm starts to better regulate night and day, sleep seems more consolidated and everything feels a little easier to handle at first. Then suddenly, naps are cut short, and your baby starts to wake every 1-2 hours at night. What could possibly be going on? A lot of parents feel an intense sense of anxiety when everything finally settles, and sleep suddenly feels like it took 10 steps back.
Some common signs:
Night wakings every 1–2 hours, even on good days
Super-short naps, just 20–45 minutes, no matter what you try
Extreme separation anxiety, fussy evenings (or the entire day), fighting the crib despite obvious yawns and heavy eyes
Suddenly needing more rocking or feeding to settle, after outgrowing it
Cluster feeding that ramps up right before bed or during wake-ups
More daytime grumpiness from all the exhaustion buildup
Heightened awareness of their surroundings
Some attempts to roll, or already rolling (Sleep regressions often happen right before, or simultaneously)
How to navigate it (before training)
I call this the R.E.S.T. framework, to better help parents understand what to do before you consider sleep training strategies. Here’s what R.E.S.T. means.
R — Routine
Having strong routines help set the tone for the rhythms of the day.
Have a strong morning routine to start the day, like a playlist and "curtain time" to let the sunlight in.
Maintain a bedtime routine where book reading can serve as a final "sleep cue" to gently transition out of rocking or feeding your baby to sleep. HOWEVER, if rocking/feeding is currently the only way to help your baby fall asleep temporarily, don’t beat yourself up.
Observe what your current sleep cues are. Dimming lights, humming a lullaby, rocking, nursing - whatever they may be, and whatever combination, the first step is to be aware of what environmental language you are giving your baby to tell him/her that “it is bedtime”. It is from this first initial awareness that we can know what to do next.
Try to “reshuffle” sleep cues appropriately. While you are feeding, feed while the lights are still on, and try to move the feeding time earlier in your routine as you try to read a final story book before sleep.
Focus on “stacking” your sleep cues. That is, while you are rocking, hum a lullaby and play white noise, for example. focus on combining cues so that the need for rocking becomes less and less, and so that you have a bigger library of options to put your baby to sleep.
It is important to note that during developmental leaps, the chaos and uncertainties come with the journey, and the key thing is your own state of mind. Do not blame yourself, and also educate yourself on what to expect during these tricky times. The better you understand the situation, and embrace your baby’s natural developmental journey, the easier it will be for parents to manage these circumstances with a calm and logical mind.
E — Environment
First and foremost, a firm mattress, a bare crib, and an appropriate swaddle or sleep sack are just some of the important elements of a safe sleep environment. Read here for more. Make sure your child is carefully monitored overnight, either with a baby monitor or with an adult caregiver in the same room.
Secondly, check your sleep environment to see if there is anything that could potentially be causing short naps or early wakings.
Check curtains for light leaks
Check odor from diaper bins
Use white noise overnight and during naps to stabilize the environment’s sound cues
Use sunlight exposure during the day to regulate your baby’s circadian rhythm
Make sure the fit of your baby’s swaddle, sleep sack or pajamas to be snug yet not too tight. (Some babies do sleep better with a tighter fit.)
If you are currently doing late night diaper changes, make sure your light is set lower to the ground, and not white light from your phone, as it could suppress melatonin levels.
If your baby is sensitive to temperature, using warm wipes is highly recommended for bum wipes to prevent your baby from waking up more than they have to at 3am in the morning. Have a clean diaper set out and ready to go on top of your changing pad.
S — Schedule
At 4 months, schedules do depend on feeding needs (see below). It is important to check with your paediatrician and structure your day based on feeding needs. The second important thing to note is to make sure they are not awake for longer than 2 hours at a time, as being awake for too long can cause adenosine and sleep pressure build up, causing a rise in cortisol that could make falling asleep and staying asleep tricker. There are individual differences however, which is why your observations matter. Suggested schedules (see below) provide a basic framework - but it should NOT be followed directly if it does not agree with your baby.
T — Temperament
At this stage, training is still very early, so it is important to first observe temperament. Prevent overstimulation in the daytime, especially after 3/4pm as we enter into in the late afternoon. The other “T” in this equation is also assessing your “Team” that can help you with baby care. It truly takes a village to raise a child, and it is important for primary caregivers to not hog all the work so that you can take rests in between. Your temperament - also impacts your baby’s temperament.
A note on feeding & medical signs
At 4 months old, babies may still need 1–2 feedings at night and that is entirely normal. You may potentially consider a set time feed at night after bedtime, to help stabilize your baby’s hunger cues. It is important to tag team, and check with your pediatrician if you are uncertain of anything, or see signs of:
loud snoring
night sweats
inconsistent breathing
restless legs during sleep
wakings due to allergies/skin irritations
excessive loud
Age-Based Sleep Needs
There is a growing body of research shows that before sleep training - tracking sleep and logging sleep alone can already help improve sleep quality for little ones. I recommend BabyConnect, or even if it is a simple journal!
Total Sleep: 12-15 h
Wake Windows: 1.5-2 h
Total Nap Time: 3.5-4.5 hours
# of Naps: 3-4
*Sleep needs are cross-referenced, evidence-based and based on data coming from global, reputable sources, along with my experience working with 100+ families. HOWEVER, there are individual difference - observation of temperament is paramount!
Sample 3-Nap Schedule
7:00 AM: Wake and feed
9:00 AM – 10:00 AM: Nap 1
11:00 AM: Feed
1:00 PM – 3:00 PM: Nap 2
3:00 PM: Feed
5:00 PM – 5:30 PM: Nap 3
6:00 PM: Feed
7:30 PM: Bedtime
11:00 PM: Dream Feed
(3-5 AM: Night Feed Option)
4 Nap Schedule: Follow sleepy cues and feeding cues, or use my web app The SleepEasy Guide for more reference schedules and suggestions.
For You
Give yourself grace. Raising a baby takes a village. It is okay to get support when you feel like you need it—don't try to do it alone!
Manage your sleep expectations and know that sleep is unstable for developmental reasons.
Easier said than done: avoid comparing your baby with other moms and other babies. Having a healthy relationship with internet research and chatter amongst other anxious new parents who are also figuring it out - things are hard enough, relationships amongst should feel supportive and not competitive!
Sleep should be regarded as personal and sacred, and therefore the approach should be mindful and holistic. If you are in the middle of this and want help navigating it, I am here to support you in building a plan that works for your family. Reach out today to schedule a consultation.
