One week your baby is settling beautifully and sleeping in long, predictable stretches. The next, they're waking every hour, refusing naps, or crying at bedtime for no obvious reason.
If this sounds familiar, please know you haven't done anything wrong, and neither has your little one. What you're likely seeing is a sleep regression, one of the most common (and most exhausting) parts of the first few years, and something almost every Milestones family experiences at some point.
What Is a Sleep Regression?
A sleep regression is a temporary change in a child's sleep patterns that follows a period of settled, predictable sleep. Despite the name, it isn't really a step backwards.
It's usually a sign that something is going right: your child's brain and body are working hard on a new skill or stage of development, and sleep is often the first thing to be disrupted while that work is underway.
Most regressions last somewhere between two and six weeks, though every child's timeline looks a little different. Some children move through certain stages without any noticeable disruption at all.
When Do Sleep Regressions Typically Happen?
While every child develops at their own pace, families tend to notice sleep disruptions clustering around a few key ages.
- 4 months: This is often the first regression parents notice, and it tends to be permanent rather than temporary. Around this age, your baby's sleep cycles mature from a newborn pattern into a more adult-like structure, with distinct light and deep sleep phases. Because babies naturally stir between cycles, this can mean more frequent waking until they learn to settle themselves back down.
- 8 to 10 months: This stage often lines up with crawling, pulling up to stand, and the emergence of separation anxiety. Your baby may wake wanting extra reassurance that you're still close by.
- 18 months: Often described as the toughest of the lot, this regression tends to coincide with a burst of independence, big emotions, and the drive to test boundaries, including at bedtime.
- 2 years: As language, imagination, and independence continue to grow, some toddlers experience a further dip in sleep, sometimes alongside new fears or the transition out of a cot.
Why Do Sleep Regressions Happen?
Sleep regressions are closely tied to bursts of physical, cognitive, and emotional development. As your child's brain builds new neural connections and rehearses new skills, sleep is often disrupted in the process.
This can happen around big leaps like rolling, crawling, talking, or understanding that you still exist even when you're out of the room.
Separation anxiety plays a big role at several of these ages, especially around 8 months and again around 18 months. According to Raising Children Network, it's a normal part of development that typically begins around six to seven months and peaks between fourteen and eighteen months.
Understanding that this behaviour is developmentally appropriate, rather than a habit or a discipline issue, can make the process much easier to sit with.
Practical Ways to Help Your Family Through It
- Keep routines consistent: predictable steps before sleep, such as a bath, book, and cuddle, give your child something familiar to anchor to, even when everything else feels unsettled.
- Offer extra reassurance, not new habits: it's fine to comfort your child more than usual during a regression, but where possible, try to avoid introducing new sleep associations you'll need to undo later, such as feeding to sleep every time or bed-sharing.
- Watch wake windows: an overtired child often sleeps worse, not better. As your child grows, the amount of time they can happily stay awake between sleeps will change too.
- Give yourself grace: regressions are genuinely tiring, and it's okay to lower the bar on other things while you get through it.
- Remember it's temporary: most regressions ease on their own within a few weeks as your child consolidates their new skill.
How We Support Sleep at Milestones
Our educators know that sleep and rest needs shift constantly in the early years. They work closely with families to keep routines as consistent as possible between home and centre.
Every child has an individual rest plan that's reviewed regularly and adjusted in partnership with you. If your little one is going through a rough patch at home, we can talk through what's working, and what isn't, and adapt their routine with them.
Our rooms are set up to support calm, low-stimulation wind-downs, with familiar comfort items, soft lighting, and consistent educators nearby. These are all things that make a real difference when a child is finding sleep harder than usual.
And because we know regressions can be just as tiring for parents as they are for children, our educators are always happy to chat at drop-off or pick-up if you want a sounding board.
Want more support around sleep? Take a look at our guides on creating a secure sleep environment for babies at Milestones and our practical tips for a safe, comforting sleep space at home.
If your child's sleep changes are lasting longer than a few weeks, or seem out of step with their usual development, it's always worth having a chat with your GP or child health nurse.