If your little one has suddenly gone from sleeping like a dream to waking every 45 minutes, welcome to the new parent club. Somewhere on social media, someone is trying to sell you magic drops or a "sleep training in 3 days guaranteed" course. We hate to break it to you, but on this occassion, there is no cure, no shortcut and no secret product, whether it's the 4 month regression, teething, a growth spurt, or one of the many other sleep curveballs still to come.
The 4 month regression tends to be the first big one, caused by your baby's sleep cycles maturing into an adult-like pattern, with lighter sleep phases where they're more likely to stir and struggle to resettle. But it's really just the first of many, whether it's teething, a growth spurt, or one of the many other sleep curveballs still to come.
The good news is that the same handful of principles help you get through pretty much all of them, here's how to make it easier on everyone, whatever stage you're at.
Build a short, boring, repeatable routine
The less exciting the wind down, the better. Bath, feed, into the sleep suit, dim lights, same two or three phrases every single time ("night night, sleep tight"). Babies start recognising patterns early, so the repetition itself becomes the sleep cue. It won't fix a regression, but it gives your baby's brain something predictable to hold onto while everything else feels new and overwhelming, at four months or fourteen.
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Get the sleep space right
A safe, comfortable, and consistent sleep space matters more than any gadget, at every stage. Room temperature around 16 to 20 degrees, no loose blankets or bumpers, and always on their back for every sleep, in line with NHS safe sleep guidance. If your baby is starting to show early signs of rolling, this is often the point parents move from a swaddle to an arms free sleep bag, which keeps them cosy without restricting movement once they're mobile in the cot.
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Rule out what might be behind the waking
Sometimes it's not a regression at all. Colic, digestive discomfort, or teething can all cause sleep disturbances. It's worth thinking about what else might be going on before assuming it's purely developmental, and having a chat with your health visitor or GP if you're unsure.
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Use sound to your advantage
White noise can be useful because it masks household noise and mimics the whooshing sound of the womb, which many babies find soothing during lighter sleep phases. The key is consistency. Same sound, same volume, every nap and every night, so it becomes part of the pattern your baby's brain starts to expect, whatever regression or disruption you're navigating.
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Pay attention to wake windows
Wake windows change constantly as your baby grows, but the principle stays the same at every age. Rather than rigidly following nap times by the clock, watch for early tired signs like rubbing eyes or going quiet, and start the wind down before the overtiredness sets in. This one change often makes more difference than anything else on this list, however old your little one is.
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Bonus Tip: Look after yourself
You cannot pour from an empty cup, and no amount of perfect routine will make broken sleep feel good. Accept help when it's offered, nap when you can rather than when you "should," and don't underestimate what a genuine break, even a short one, does for your ability to cope. Some days survival looks less like a sleep strategy and more like a strong coffee and five minutes to yourself.
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