As a professional baby sleep consultantI hear the term “regression” used in regards to just about every imaginable circumstance. Essentially, if baby doesn’t sleep well for a couple of nights, parents start dropping the ‘R’ word. Some people subscribe to the idea that there’s the 4 month sleep regression, a 8 month baby sleep regression, a 9 month baby sleep regression, a 1 year baby sleep regression, as well as teething regressions, growth spurt regressions, and so on. Others see these as simple hiccups caused by extenuating circumstances. But the 4 month old  sleep regression, everybody agrees on, and for good reason. It’s the real deal, and it’s permanent. And I am here to give you all the baby 4 month sleep regression help you need!

So in order to understand what’s happening to your baby during this stage of the baby 4 month sleep regression, first you need to know a few things about sleep in general. So here’s the science-y part, told in plain English.

Many of us just think of sleep as an on-or-off situation. You’re either asleep or you’re not. But sleep actually has a number of different stage. These stages make up the “sleep cycles,” which we all go through several times a night. The first step to getting your baby 4 month sleep regression help is to understand the stages of sleep. 

Baby 4 Month Sleep Regression

Stage 1 is that initial stage we’re all familiar with where you can just feel yourself drifting off. But don’t really feel like you’ve fallen asleep. Anyone who has ever seen their partner nodding off in front of the TV, told them to go to bed, and gotten the canned response of, “I wasn’t sleeping!” knows exactly what this looks like.

Stage 2, which is considered the first “true sleep” stage. This is where people tend to realize, once woken up, that they actually were sleeping. For anyone taking a “power nap,” this is as deep as you want to go, or else you’re going to wake up groggy.

Stage 3 is deep and regenerative. Also known as “slow wave” sleep, this is where the body starts repairing and rejuvenating the immune system, muscles tissue, energy stores, and sparks growth and development.

Stage 4 is REM (rapid eye movement) sleep. This is where the brain starts to kick in and consolidates information and memories from the day before. It’s also the stage where we do most of our dreaming.

Once we’ve gone through all of the stages, we either wake up or come close to waking up, and then start over again until the alarm goes off.

Baby 4 Month Sleep Regression Help

So what does this have to do with the baby 4 month sleep regression help we were talking about?

Well, newborn sleep only have 2 stages; stage 3 and REM, and they spend about half their sleep in each stage. But at around the third or fourth month, there is a reorganization of sleep. As they embrace the 4-stage method of sleep that they’ll continue to follow for the rest of their lives.

When this change takes place, baby sleep moves from 50% REM sleep to 25% in order to make room for those first two stages. So although REM sleep is light, it’s not as light as these 2 new stages that they’re getting used to. With more time spent in lighter sleep, there’s more of a chance that

baby’s going to wake up.

That’s not to say that we want to prevent or avoid baby waking up. Waking up is absolutely natural. We continue to wake up three, four, five times a night into adulthood and even more in old age.

As adults, however, we’re able to identify certain comforting truths that baby might not be privy to. When we wake in the night, we’re able to recognize that, “Hey, I’m here in my bed, it’s still nighttime, my alarm isn’t going to go off for another three hours, and I’m reasonably certain that there are no monsters lurking under my bed. I can go back to sleep”

And we do. Usually so quickly that, the next morning, we don’t even remember the brief encounter with consciousness.


A 4 month old baby, of course, lacks these critical thinking skills. To a 4 month old baby who fell asleep at her mother’s breast, the reasoning could go much more to the tune of, “OK, last thing I remember, there was a familiar, beloved face. I was having dinner. And someone was singing me a soothing song about the a twinkling star. Now I’m alone in this dark room. There’s no food and there’s probably at least three, possibly four, scary monsters in the immediate vicinity.”

That’s probably an exaggeration. But who knows what goes on in the mind of a four month-old baby?

Anyways, now that baby’s suddenly realized that Mommy’s not around, and they’re not entirely sure where they’ve gone, the natural response is to do a little freaking out. That stimulates the fight-or-flight response. And, next thing you know, baby’s not going back to sleep without a significant amount of reassurance that everything is OK.

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Baby 4 Month Sleep Regression Signs

MORE Night Wakings

This goes without saying. And it’s probably the reason you’re reading this to begin with. 4 month old babies generally will wake up in the middle of the night. Most babies this age still need one or two night time feeds. They may need a diaper change. But if you find that your baby is waking up more frequently, that’s a clear sign that your baby is in the 4 month sleep regression. 


Another 4 month sleep regression sign is increased fussiness. 4 month old babies can be fussy during the day. But if you find your little one is more fussy than normal and that this fussiness is affecting bedtime, they may be entering the 4 month sleep regression. You may even find that your little one is inconsolable at times when they didn’t use to be. Or perhaps the fussiness is affecting your baby’s appetite. These are all indications that your baby may be in the 4 month sleep regression.  


The third of the baby 4 month sleep regression signs, I find, is reliance on “sleep props”. A sleep prop is something external that your baby uses to get to sleep. So generally, up until this point, parents have either been putting their baby to sleep by rocking them, bouncing or by breastfeeding them, or some similar technique where baby is helped along on the road to falling asleep. Check out how to break the nightly feeding to sleep habit

Now that baby’s spending more time in light sleep, and therefore has a higher probability of waking up, this suddenly becomes a much bigger issue. These sleep props or sleep associations can be very sneaky indeed. Although they may be helpful in getting your little one to that initial nodding off stage, the lack of them when they wake up 

means that baby’s not able to get back to sleep again without some outside help. Cue the fight-or-flight, the crying, and the adrenaline. When this starts happening every half an hour, parents can find themselves in a nightmarish situation.


Now that your baby is more aware of their surroundings, the reliance on sleep props generally leads to shorter naps too. For example, if your baby is needing to be rocked to sleep for their naps, then they’re going to sleep through one sleep cycle. That sleep cycle lasts about 30 minutes. Then when they come to the surface of sleep between those sleep cycles, they realize that they’re not in your arms anymore. 

And they need you to either come and rock them back to sleep to get a longer nap, or are just awake. And all we got was that 30 minute nap.  

Baby 4 Month Sleep Regression Solutions

So, the good news for anyone experiencing the dreaded Baby 4 Month Sleep Regression is that it’s not, in fact, a regression at all. A regression is defined as “reversion to an earlier mental or behavioral level,” and that’s actually the opposite of what your baby is experiencing. This would be much more aptly titled the “Four Month Sleep Progression

So, onto the big question… what can you do to help baby sleep? Is there a baby 4-month sleep regression solution? You betcha mama! Here are my top 3 baby 4 month sleep regression tips and solutions:


The first of my baby 4 month sleep regression solutions is get all of that light out of baby’s room. I’m not kidding around here. You might think that baby’s room is dark enough, or that baby might not like the dark. So you may think that it’s comforting to have a little bit of light coming through the windows or seeping in from the hallway.


Baby’s room should be dark. I mean coal mine on a moonless night kind of dark. This will provide some baby 4 month sleep regression help. Tape garbage bags over the windows if you have to, or cover them with tinfoil. (Just be prepared to explain it to the police when the neighbors accuse you of running a grow-op.) I use the EZ Blackout Window Covers.

Newborns and infants are not afraid of the dark. They are, however, responsive to light. Light tells their brains that it’s time for activity and alertness. The brain secretes hormones accordingly, so we want to keep that nursery absolutely pitch black during naps and bedtime.


The second of baby 4 month sleep regression tips is white noise. Because the other nemesis of daytime sleep, (and nighttime for that matter, although not nearly as often) is noise. Whether its UPS ringing the doorbell, the dog warning you that the squirrels are back and for sure going to attack the house this time, or something falling on the floor three rooms away. With baby spending more time in lighter sleep, noises will startle them easily. This will wake them up, so a white noise machine is a great addition to your nursery.

“Wait, isn’t that a prop,” you’re asking. Well, in a way, it is, but it doesn’t require any winding, resetting, reinserting, or parental presence. It’s just there and it can be on as long as baby’s sleeping. So it’s not a prop we need to avoid and instead something that can provide baby 4 month sleep regression help.


The third of the baby 4 month sleep regression tips is to ensure your baby is getting enough sleep during the day and at night. A four month sleep schedule is incredibly important. To help with your baby 4 month sleep regression naps, here’s how much sleep your baby needs during the day:

Your daytime four month sleep schedule should include 3-4 naps a day. Each of those naps should be between 1.5 –  2 hours long. If your baby is taking short naps, here’s some tips on how to extend nap lengths

Bedtime routines are also an essential component to providing a baby 4 month sleep regression solution. Try to keep the routine to about 4 or 5 steps, and don’t end it with a feed. Otherwise, you risk baby nodding off at the breast or the bottle. That will create the dreaded “association” that we talked about earlier.

So try to keep the feed near the beginning of the routine and plan the songs, stories, and getting into PJs towards the end. The whole process should be about 20 – 30 minutes long, and baby should go into their crib while they’re still awake. Here’s the bedtime secret that every mom must know

If you’re noticing baby getting fussy before bedtime, you’ve probably waited too long. A four month sleep schedule should really only have baby going about two hours between snoozes. Bedtime should be between 6:30 and 8 at night. 


How about the baby 4 month sleep regression night feeding? Does the 4 month sleep solution mean that I can’t feed my baby at night anymore? You can absolutely still do a nighttime feeding or two. Most babies aren’t ready to sleep through the night until they’re around 15 lbs or 6 moths of age. 

When I work with families to create a customized sleep plan and provide a permanent baby 4 moth sleep regression solution, I generally do keep one or two feeds at night. The key to the baby 4 month sleep regression night feeding is just to make sure that your little one isn’t falling asleep during that feed. Your little one should be going into their crib drowsy but awake after those middle of the night feeds. 


The last of the 4 month sleep regression tips is to hold off on introducing solids. The American Academy of Pediatrics and The World Health Organization recommend waiting to introduce solids until around 6 months of age. For the first 6 months of your baby’s life, they will be getting all the nutrients and energy that they need from breastmilk or formula alone. 

Before 6 months of age, your baby’s gut and kidneys are still developing. Introducing solids too soon can also cause diarrhea and constipation, which can really interfere with your baby’s sleep due to the discomfort they may be feeling. Check out our blog on Introducing Solids to Your Baby to learn about the signs to look for when your baby is ready to begin solids, what foods are best to start with and what textures you should use. 

Future Regressions Past The Baby 4 Month Sleep Regression 

Now, there are going to be regressions, actual regressions, later on in your little one’s youth. Check out our Sleep Regression Ages blog to learn more about each sleep regression that your little one will encounter as they get older. Traveling, illness, cutting teeth, all of these things can cause your little one to have a few bad nights in a row. But when it comes to the four month “progression,” I’m happy to report that this is a one-time thing. Once you’re through this, your baby will have officially moved into the sleep cycle that they’ll essentially be following for the rest of their life. Four glorious stages repeated multiple times a night.

4 Month Sleep Training 

And by taking this opportunity to teach them the skills they need to string those sleep cycles together, independently, prop-free, without any need for nursing to sleep, rocking, or pacifiers, you’ll have given them a gift that they’ll enjoy for the rest of their young lives.

Of course, some kids are going to take to this process like a fish to water. And some are going to be a little more resistant. If yours falls into the former category, count yourself as lucky! Take delight in your success, and go ahead and gloat about it on Facebook.

For those of you in the latter camp, I’m happy to provide your baby 4 month sleep regression help. Just visit my website or give me a call and we can work on a more personalized program for your little one using gentle sleep training methods. The most common thing I hear after working with clients is, “I can’t believe I waited so long to get some help sleep training baby!” So if you’re considering hiring a consultant, now is absolutely the time. I offer a free 15 minute evaluation so I can get to know the specifics about your little one’s situation, so book a call now and we can move forward as soon as you’re ready to get your little one sleeping through the night!

About the Author

I’m Kaley Medina, the proud founder of Live Love Sleep®. I live in Texas with my husband and high school sweetheart, Zeke, along with our two wonderful children, Evalyn and Leo, and our furry companion, Louie.
My journey into the world of sleep consultancy began with the sleep struggles of my own daughter, Evalyn. From her early days, she proved to be a challenging sleeper, staying awake for waaaaaay too long and causing many sleepless nights. I tried everything I could think of, from feeding her to sleep to bouncing on a yoga ball until my legs ached to the delicate process of transitioning her to her crib without waking her. I even resorted to late-night vacuuming while wearing her in a baby carrier….needless to say, none of it work.

The constant sleep deprivation left me frazzled and unable to enjoy precious moments with my family. Desperate for a solution, I ventured into the world of sleep training when Evalyn turned six months. To my surprise,

gentler methods yielded incredible results, transforming our lives. Fueled by this success, I became a Certified Sleep Consultant and founded Live Love Sleep®. As your Pediatric Sleep Consultant, I understand that a child’s sleep is influenced by various factors, including diet, sleep environment, routines, schedules, developmental milestones, and so much more.
I craft personalized sleep plans that consider the bigger picture to solve your child’s sleep challenges comprehensively. What sets my services apart is the ongoing support I provide, ensuring your family reaches its sleep goals within weeks.
A former client described the experience as “utterly LIFE CHANGING.” I’m committed to helping parents like you and your child get the rest you need and deserve. Let’s work together to achieve better sleep and a happier, healthier family life.


Kaley has been featured on numerous podcasts, on NBC, CBS, Yahoo!, Forbes, Texas Today, MindBodyGreen,, Work & Mother, Homes and Gardens, TinyBeans, and more!