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Around month two, my daughter started sleeping in 4 to 5 hour stretches.
My husband and I looked at each other like we had won something. Like maybe, just maybe, we had a unicorn baby. We started telling people. We started feeling smug, quietly, in the way new parents do when they think they have figured it out.
And then month four arrived.
She started waking at completely random intervals, crying in a way that was different from her newborn cry — more confused than hungry, more unsettled than in pain.
We would feed her, settle her, put her back down. An hour later, same thing. Then again. We ran through every possibility.
Is she sick?
Is something hurting her?
Did we do something wrong?
We had not done anything wrong.
She was doing something exactly right.
What was happening inside her tiny body during those weeks was nothing short of extraordinary. And once I understood it — really understood it — everything shifted.
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What the 4-month sleep regression actually is
The 4-month sleep regression is not a setback. That is the first thing I want you to hear.
It is a permanent change in the way your baby’s brain processes sleep.
Until around month four, newborns cycle through sleep differently than adults. They move from drowsiness into deeper sleep more quickly and can stay there for longer stretches.
From around four months onward, their sleep architecture begins to change. Their sleep cycles become lighter and more mature. They start having more frequent partial wake-ups between cycles. And because they are more aware of the world now, those little wake-ups can become full wake-ups.
At the same time — and this is the part that filled me with awe when I finally understood it — their brains are developing at a pace they will never experience again.
Object permanence is beginning.
They are becoming more visually aware.
They are making connections between sounds, faces, routines, and comfort.
They are starting to understand that they are a separate being from you, which is both a developmental leap and, for a baby, a genuinely unsettling realization.
They wake between sleep cycles. They are suddenly more aware and curious and stimulated. And they need help returning to sleep because they have not yet learned how to do it independently.
That is it.
That is the whole regression.
Not broken sleep.
Not bad habits.
Not a baby manipulating you.
Just a tiny brain doing enormous work.
We stopped trying to do it “right” and started doing what felt natural
I want to be honest with you about something.
We never sleep trained.
Not at four months. Not at six months. Not ever.
I know that is not what a lot of baby sleep advice says. I know there are methods and schedules and approaches that promise results in three days. I am not here to tell you those are wrong for every family. I genuinely believe parents know their babies and their own limits.
But for us, at some point during those exhausting four-month weeks, we made a decision that quietly changed everything:
We stopped trying to do everything “right” and started doing what felt natural — to us and to her.
What felt natural was feeding her to sleep.
I know. I know what all the sleep books say about that. I read them. But the truth is, breastfeeding to sleep is one of the most biologically normal things in the world. Nursing is comfort. It is regulation. It is closeness. It is not just food.
We also kept her very close at night.
I want to be careful here, because safe sleep matters and every family needs to make informed choices. The safest general recommendation is for babies to sleep on their backs, on a firm, flat, separate sleep surface in the parents’ room.
A bedside crib or bedside bassinet can be such a helpful middle ground here: baby is close enough that you can hear every little stir, but still on their own separate sleep surface.
For our family, we spoke with our pediatrician, learned the safe sleep guidance, and made the choices that felt right for our situation. I am sharing that as our story, not as a rule for anyone else.
What mattered most to me was this: she was close, I could respond quickly, and we were not fully starting the day every time she woke.
It was not the approach the internet recommended.
It was the approach that worked for our family, that felt right in our bodies, and that let all three of us get the most sleep we could.
The one thing we never skipped: our bedtime routine
Here is where I will be very direct with you.
If there is one thing I credit most with getting through the regression — and the months that followed — it is this:
Every single night, in the same order, without exception.
1. A short oil massage
Warm coconut oil. Gentle strokes. Legs, arms, back.
Five minutes.
She still reaches for this now at two years old.
It was not fancy. It was not a long spa-like baby routine. It was simply a way to tell her body: we are done with the day now.
2. A warm bath
Not long.
Just enough to signal: the day is over, we are winding down.
Some nights she loved it. Some nights it was quick. But the rhythm stayed the same.
3. Into pyjamas
The changing of clothes became its own ritual.
A clean diaper. Soft pyjamas. Lights low.
It was one of those tiny repeated cues her nervous system learned to recognize.
4. Feed while singing
This part was everything.
In the dark or near-dark, with the white noise on, I fed her while singing the same songs every night. Slowly. Quietly. Like a lullaby.
No bright lights.
No scrolling.
No trying to make the room exciting.
Just feed, sing, breathe, repeat.
5. Affirmations
This one I want to talk about.
Every night, I would say things to her:
You are loved.
You are safe.
You are enough.
Mama is always here.
At four months, she stared at my face while I said them.
At one year, she started making sounds along with mine.
At two years old, she says them with me, word for word, before she falls asleep.
I cannot put into words what that means to me.
The routine did not make the regression disappear. But it gave her nervous system a consistent signal that sleep was safe and coming.
Babies going through enormous developmental change need predictability more than anything.
Her daytime world was exploding with new information.
Her night world stayed the same.
What helped us most during the 4-month regression
Alongside the routine, a few practical things made a real difference.
These were not magic fixes. Nothing made the regression vanish overnight. But these helped make the nights calmer, darker, more predictable, and less chaotic.
1. A bedside crib or bedside bassinet
If I were preparing for the 4-month regression again, I would absolutely prioritize a safe bedside sleep setup.
Having the baby close matters so much during this stage. They stir, wake, fuss, feed, resettle, and repeat. The closer they are, the less dramatic every wake-up feels.
A bedside crib or bassinet gives you that closeness while still keeping baby on their own separate sleep surface. You can hear the early stirring before it becomes a full cry, respond quickly, and avoid turning every wake-up into a full production.
For us, closeness was not about creating a “bad habit.” It was about survival, responsiveness, and getting through a developmental leap with as much calm as possible.
2. Blackout curtains
Blackout curtains were completely non-negotiable for us from month two onward.
A baby who is newly aware of her environment and light-sensitive will notice every little shift. Morning light. Streetlights. A hallway glow. The sun coming through earlier than you expected.
We used Deconovo Blackout Curtains because they were affordable, genuinely dark, and easy to hang.
This was one of the simplest changes that made the room feel more sleep-friendly.
3. White noise
White noise stayed on all night, every night.
The Hatch Rest+ Sound Machine was already on our nightstand from the newborn days, and it stayed there through the regression.
Consistent low white noise helped mask the little sounds that suddenly started waking her: a door, a car outside, a cough, someone moving around.
I also liked that it was phone-controlled, so I did not have to get up and fiddle with anything in the dark.
4. The nursing pillow
The Boppy Original Nursing Pillow was my best friend through every single feed.
By four months, she was heavier. Night feeds were longer some nights, shorter other nights, but always frequent enough that my arms and back noticed.
The Boppy gave me support when I was exhausted and feeding half-asleep. For the number of times we fed at night during this phase, proper support was not a luxury. It was the thing that kept my body from feeling completely wrecked.
5. No bright lights
This was a rule we held firmly, even on the worst nights.
No overhead lights. No bright lamps. No phone flashlight.
If we needed to see, we used the dim glow of the Hatch at its lowest setting.
A baby who wakes in the dark and returns to dark has a much easier time going back to sleep than one suddenly flooded with light.
The calmer night setup I’d prepare before the 4-month regression
If you are in the thick of it — or you are trying to prepare before it hits — this is the setup I would focus on first:
- A safe bedside crib or bassinet
- Blackout curtains
- Hatch Rest+ or another steady white noise machine
- Nursing pillow or feeding support
- Soft zip pyjamas
- Water bottle for you
- Burp cloths within reach
- Nipple cream if breastfeeding
- A long phone charger near the bed
Read my Postpartum Feeding station set up guide for easy 3AM feed management.
Not because products fix baby sleep.
They do not.
What we actually did when she woke
She would stir.
Because she was close, I often heard her before she fully woke.
I would offer a comfort feed. She would take a little, sometimes a lot. Then she would go back to sleep.
We did not try to extend the feeds.
We did not cut them short.
We did not try to settle her without feeding just because a book said we should.
We responded to what she needed in that moment.
Some nights that meant three wake-ups. Some nights it meant one. Some nights it felt like she had just gone back to sleep and was awake again.
Eventually — gradually, without us doing anything dramatic — the wake-ups became fewer.
She would stir, settle slightly, and drift back without needing me every time. That came with time, not because we trained it, but because she grew into it.
She still woke every three hours or so for a comfort feed until well past six months.
How we eventually removed that comfort feed as she got older is a whole other story. But during the regression itself, we never made removing the comfort feed our goal.
Our goal was much simpler:
Everyone gets as much sleep as possible.
The baby feels safe.
We do not lose our minds.
That was enough.
To the parent reading this at 3am
You are not failing.
Your baby is not broken.
The regression feels endless when you are in it. It is not endless.
It passes — not because you fix it perfectly, but because your baby’s brain finishes what it started and moves on to the next extraordinary thing.
If you take nothing else from this post, take this:
Keep the room dark.
Keep the white noise on.
Keep the routine the same every night.
Keep the baby close in a way that feels safe and informed for your family.
Trust your instincts about how to respond.
You know your baby.
The internet does not.
And if feeding to sleep is what feels right for both of you, you are not doing it wrong.
You are doing what works for your family. That is the only standard that counts. Lots of love, Mama Rooted
📌 Save this for the parent in your life who just hit month four. They need to read it.
