Sleep Training a 4 Month Old: What I Look at First
Four months is an interesting age when it comes to sleep. Your baby is no longer sleeping quite like a newborn, but they’re also still very young and going through a lot of developmental changes.
When parents come to me wanting help with sleep training a 4 month old, one of the first things I explain is that there isn’t one approach that works for every baby. Parents sometimes think they need to wait until six months to start working on sleep or to see real progress, but that isn’t necessarily the case.
A lot of progress can be made at four months, but a lot of progress can also be made well before four months. Really, healthy sleep habits can start from the day you bring your baby home from the hospital. It’s about making small, intentional changes along the way that continue to build on one another. Those little steps add up, and by four months, you may already have a really strong foundation for sleep.
The 4 Month Sleep Regression Changes Sleep
Around four months, your baby’s sleep begins to mature. Instead of sleeping the way they did as a newborn, they begin moving through more defined stages of sleep. This is why you may suddenly see more frequent wake-ups or those frustrating 30- or 40-minute naps.
There are several reasons this can happen. Sometimes the wake window isn’t quite right, leaving your baby either not tired enough or overtired going into a nap. If naps aren’t placed at the right times and sleep pressure isn’t quite right, it can make it harder for your baby to connect their sleep cycles.
When they wake between sleep cycles, it doesn’t necessarily mean they’re done sleeping. If your baby is used to being rocked, bounced, fed, or helped to sleep, they’ll likely look for that same help to get back to sleep when they wake.
Why I Start With the Day
One of the biggest things I tell parents is: your daytime routine predicts nighttime success.
Before focusing heavily on what happens at 2:00 AM, I want to know what happened from the moment your baby woke up that morning. Were their wake windows appropriate? Did naps land at the right times? Did your baby get enough daytime sleep without getting too much? Did they get enough nutrients during the day? Did bedtime fall at a time when your baby was actually ready for sleep?
A four-month-old who goes into bedtime overtired may struggle to fall asleep and stay asleep. And a baby who isn’t tired enough may have those same struggles. Finding that balance and learning to recognize your baby’s cues is a big part of what I work on with families, so you’re not left guessing.
This is why I start by laying the foundation first. I work on getting wake windows and naps in the right place so your baby has the right amount of sleep pressure and is ready for sleep without becoming overtired. Then, when they’re ready, we can work toward more independent sleep so they become more confident and able to connect those sleep cycles on their own.
Can You Sleep Train a 4 Month Old?
When it comes to this age, truly every baby is a little different. Sometimes it’s more about building the right foundation so sleep can start falling into place naturally. However, I’ve definitely worked with four-month-olds who are ready for more independent sleep, and when they are ready, the signs are usually pretty clear.
That’s why I don’t take the exact same approach with every four-month-old, or really any baby for that matter. I look at the baby in front of me, what they’re developmentally ready for, and where we can make progress without pushing them before they’re ready.
Sleep Training Doesn’t Have to Be All or Nothing
Parents sometimes hear “sleep training” and immediately picture putting their baby in the crib and letting them cry. It doesn’t have to look that way. There are a lot of pieces we can work on first. We can adjust the schedule, improve naps, make sure daytime feeding is supporting nighttime sleep, and look at how your baby is getting to sleep in the first place.
Some babies may be ready for more independent sleep at four months. Others may need more time. The goal isn’t to force a four-month-old into a rigid schedule or expect perfection. It’s to create the conditions that make longer, more consolidated sleep possible.
When the Foundation Is There, Sleep Can Happen Naturally
Sometimes, when the right foundation is in place, longer stretches of sleep start happening naturally. In fact, many babies are capable of sleeping 10 to 12 hours at night by around three or four months old under the right conditions.
And this isn’t even necessarily through more traditional forms of sleep training. Sometimes it’s simply about getting the pieces in place: the right wake windows, naps, daytime feeding, bedtime, and overall rhythm of the day. When those things begin working together, sleep can naturally start to consolidate.
Every baby is different, which is why I look at the baby in front of me and figure out what may be getting in the way of sleep and what they’re actually ready for. Sometimes small changes can make a really big difference.
If you’re struggling with your four-month-old’s sleep, I can look at the entire day and help you make adjustments based on your baby’s individual needs. Because when we get the day right, the night often starts falling into place too.