The Four Month Sleep Regression What Nobody Tells You and How to Get Through It
It is 3am. Your baby was sleeping in four hour stretches last week. Tonight you have been up six times already. What on earth happened?
If your baby was starting to sleep a little better and has suddenly gone completely backwards -- waking more, harder to settle, fighting every nap -- there is a very good chance you have hit the four month sleep regression. And if you are currently in the thick of it, I want you to know that you are not imagining it, you have not done anything wrong, and it absolutely does get better.
So what actually is the four month sleep regression?
Unlike later regressions which are usually triggered by developmental leaps, illness or changes in routine, the four month regression is actually a permanent change in the way your baby sleeps.
Up until around four months, babies spend most of their sleep in a deep, heavy sleep state. Around this age their sleep cycles mature and start to resemble adult sleep patterns -- moving through lighter and deeper stages and briefly waking between each cycle.
The problem is that if your baby has relied on feeding, rocking or being held to fall asleep, they will now need that same thing every single time they surface between sleep cycles. Which, if cycles are running at around 45 minutes, can mean a lot of wake ups.
How long does it last?
This is the question every exhausted parent wants answered. The honest answer is that it varies. For some babies things settle down within two to three weeks. For others, particularly those who have strong sleep associations like feeding or rocking to sleep, the regression can last much longer without some gentle intervention.
The good news is that with the right support, you can help your baby learn to navigate those sleep cycles much more independently -- and that makes a huge difference.
Signs you are in the four month regression
You might be dealing with the four month regression if:
Your previously okay sleeper has suddenly started waking far more frequently. Naps have become shorter and harder to achieve. Your baby is harder to settle than usual and seems overtired but fights sleep. Early morning waking has crept in. Your baby seems genuinely unsettled even after feeding.
What can you do about it?
The four month regression is not something you can prevent, but there are things you can do to help your baby through it:
Look at sleep associations. If your baby needs you to be there every time they fall asleep, now is a good time to gently start shifting that. Helping your baby learn to fall asleep more independently means they can resettle themselves between cycles rather than calling for you every time.
Protect naps. An overtired baby finds it much harder to sleep. Do whatever you need to do to make sure your baby is getting enough daytime sleep, even if that means contact napping for now while you work on things gradually.
Watch wake windows. At around four months most babies can manage around 90 minutes to two hours of awake time before needing to sleep again. Keeping an eye on this can really help with settling.
Be consistent. Whatever approach you take to sleep, consistency is key. Chopping and changing makes it much harder for your baby to learn what to expect.
Lean on your support network. This is a tough season. Do not be too proud to ask for help, whether that is a partner taking a shift, a family member coming to give you a break, or reaching out to a sleep consultant.
When you need a bit more support
The four month regression can feel completely relentless, especially when you are already exhausted. If you are weeks in and things are not improving, or if the broken nights are really starting to affect your mental health, please do not just push through it alone.
The regression is temporary. The foundations you build right now are not. This is actually one of the best opportunities you will ever have to set your baby up for brilliant sleep. Let me help you make the most of it.
Ten years as a Norland nanny and 17 years working with babies and children means I have sat with more exhausted families than I can count. Add my OCN qualification from the Sleep Consultant Academy and I know this stuff deeply. Night Night by Zoom wraps everything into one supportive package -- a bespoke sleep plan, daily WhatsApp access and follow up calls over two to three weeks so nothing ever feels like you are going it alone.
Book your free discovery call here.
