When do sleep regressions usually happen?
Parents often notice sleep changes around 4 months, 8 to 10 months, 12 months, 18 months, and 2 years. These aren't dates you need to circle on the calendar. Your child might sleep perfectly through one stage and struggle through another. Some children also have a rough week that doesn't match any of these ages.
There's usually something changing around these times. Your baby might be learning to crawl, dropping a nap, or suddenly getting upset when you leave the room. Even a change in how much daytime sleep they need can throw bedtime off. Rather than blaming every bad night on a regression, take a look at what's happening in your child's day right now.
What happens during the 4-month sleep regression?
For many parents, this is the first real sleep shock. A baby who used to sleep for a decent stretch might suddenly wake every few hours, take 30-minute naps, or need help settling again and again. Around 4 months, babies go through lasting changes in their sleep patterns. Those lovely newborn stretches might not be so predictable anymore.
Keep things simple. Stick with your usual bedtime, have a quiet wind-down, and give your baby a chance to settle if they're comfortable doing so. Don't change five things at once. If you're running on empty, take turns with another caregiver when possible. And please don't feel you've created bad habits by comforting your baby when they need you.
Why do babies wake more at 8 to 12 months?
Around 8 to 10 months, you might suddenly find that your baby cries the moment you walk out of the bedroom. They may also wake up ready to practise sitting, crawling, pulling up, or another new trick. Separation anxiety can kick in around this time too. That little trip out of the room suddenly feels like a very big deal to them.
Around 12 months, nap changes and a growing urge to do things independently can cause another unsettled spell. Your toddler might refuse their nap, even while rubbing their eyes at the kitchen table. Keep bedtime familiar, offer comfort when they need it, and don't drop a nap just because of a few difficult days. Give things a little time before deciding the routine needs changing.
What changes at 18 months and two years?
Toddlers have plenty of opinions, and bedtime is often when they choose to share every single one. Around 18 months, separation worries, growing independence, and changing nap needs can mean more bedtime protests and night waking. Suddenly, they need water, another cuddle, or just one more story. Sound familiar? Keep your boundaries familiar, even when your toddler has other plans.
Around age two, a bigger imagination, new fears, and a stronger need to make decisions can make bedtime tricky. The child who happily climbed into bed last month might now insist they're not tired. Offer two simple choices, such as the blue pajamas or the green ones, or one favorite book instead of another. Be kind, but hold your ground. You don't need to turn every bedtime into a lengthy discussion.
How can you get through a sleep regression?
Go back to the routine that was working before things got difficult. A bath or wash, pajamas, a story, a cuddle, and the same goodnight phrase can help signal that the day is over. Keep the bedroom comfortable and the evening quiet. If naps are all over the place, still offer daytime rest around the usual times rather than changing the entire schedule overnight.
Give yourself a break, too. Some nights will be a mess, and that's okay. Reassure your child, respond in a consistent way, and share night duties if another caregiver is around. If you're losing track of what's changed, jot down bedtime, naps, and night waking for several days. If sleep problems keep going, are unusually disruptive, or come with other worrying changes, speak with your child's pediatrician.
Parents also ask
What is the hardest sleep regression age?
It depends on the child and the family. Many parents find the 4-month regression particularly tough because longer stretches of sleep can suddenly turn into frequent waking. The toddler stages can be hard too, especially when separation worries and bedtime battles happen at the same time.
How long does a sleep regression usually last?
It varies. Some rough patches pass in a few days, while others take several weeks to improve. Keep bedtime familiar and respond consistently. If the disruption carries on or something doesn't feel right, speak with your child's pediatrician.
Should I change my child's bedtime during a regression?
Not straight away. Try keeping the usual bedtime and wind-down routine first. If your child regularly seems overtired or simply isn't ready to sleep, a small schedule change might help. Watch what happens over several days rather than making changes after one bad night.
Practical ideas from our team, not medical advice. For anything about your child's health, sleep, or development, please check with your pediatrician.
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