The 12-Month Sleep Regression: Why It's Happening and What to Do About It

The 12-Month Sleep Regression: Why It's Happening and What to Do About It

​Has your baby suddenly started waking during the night again, fighting naps, or resisting bedtime as they near their first birthday? If so, you might be dealing with the 12-month sleep regression—a frustrating (but totally normal) phase that can turn sleep upside down just when you thought you’d found your rhythm.
As a certified pediatric sleep consultant, I’ve helped countless families navigate the ups and downs of regressions—including the tricky one-year mark. And here’s what I want you to know: this regression doesn’t have to derail your progress.
Let’s break down what’s behind the 12-month sleep regression, how long it typically lasts, and most importantly—what you can do to get sleep back on track.

What Is the 12-Month Sleep Regression?

​The 12-month sleep regression is a period of disrupted sleep that often happens right around your child’s first birthday. You might notice:

• Increased night wakings
  
• Sudden refusal of naps (especially the second nap)
  
• Fussiness or tantrums at bedtime
  
• Shorter naps or skipped naps altogether
  
• More early morning wake-ups
  
• Separation anxiety, clinginess, or resistance at sleep times
  

Sound familiar? You’re not alone. This regression is often mistaken for a permanent change in sleep needs—but that’s not usually the case.

What Causes the 12-Month Sleep Regression?

​A lot is going on developmentally around 12 months, and these big leaps can absolutely impact sleep:

• Walking and gross motor development: Your little one may be taking first steps, cruising along furniture, or practicing standing—and their brain is busy processing these new skills, even at night.
  
• Language development: Around the one-year mark, babies experience a language explosion. All that cognitive growth can make it harder for the brain to wind down.
  
• Nap transition confusion: Some babies look like they’re ready to drop to one nap, but most aren’t truly ready until 14–18 months. Attempting to drop a nap too early often leads to overtiredness and disrupted night sleep.
  
• Separation anxiety: Around this age, separation anxiety often peaks. Your baby may resist sleep simply because they don’t want to be away from you.
  

How Long Does the 12-Month Sleep Regression Last?

​Most sleep regressions—including the 12-month sleep regression—last anywhere from 2 to 6 weeks. But how you respond during this phase can make a big difference.
If you suddenly start rocking or feeding your baby to sleep every time they wake, or if you rush to drop a nap that they’re not actually ready to lose, you may find that the short-term sleep disruption becomes a longer-term habit.
​

How to Handle the 12-Month Sleep Regression

​Here are my top sleep consultant tips for getting through this regression:

1. Stick with two naps a day—for now
   Even if your baby resists the second nap, most aren’t developmentally ready for a one-nap schedule until 14 to 18 months. Don’t rush the transition.
   
2. Keep your bedtime routine consistent
   A calm, predictable routine helps your child wind down and signals that it’s time for sleep, even when the day’s been off.
   
3. Allow plenty of time for movement
   Let your baby burn energy and practice new skills (like walking or climbing) during the day so they’re not tempted to do it at 2 a.m.
   
4. Offer comfort without creating new sleep associations
   You can respond to your baby during this phase with comfort and reassurance—without introducing new sleep habits you don’t want to maintain.
   
5. Be patient and supportive
   This is a big time of growth, and a little extra patience (with yourself and your baby) goes a long way. That said—you don’t have to “wait it out” alone.
   

Is It Really a Regression—Or Something More?

Sometimes what looks like a sleep regression is actually a sign of a bigger sleep challenge. If your baby has never slept well, or if you were already struggling with frequent wakings, short naps, or bedtime battles before this phase began, it might be more than just a regression.

If you’re unsure whether this is a temporary setback or a deeper issue with sleep habits, I’d love to help. I offer a 30-minute Ask Me Anything call where we can talk through your child’s sleep, see if I can give you some actionable steps to take, and see whether they’d benefit from more personalized support.
👉 Book Ask Me Anything Call Here

Want Help Getting Through the 12-Month Sleep Regression?

My Sleep Regression Solution Guide is your go-to toolkit for navigating the most common sleep setbacks—without creating new habits you’ll have to undo later.
Inside, you’ll find:

• Clear explanations of what’s happening at 4, 8–10, 12, 18, and 24 months
  
• Age-appropriate, step-by-step strategies to help your baby or toddler sleep better
  
• Scripts, bedtime routines, and nap schedules
  
• Gentle techniques to handle separation anxiety, bedtime battles, and nighttime wake-ups
  
• Guidance on sleep props, fear-based stalling, crib-to-bed transitions, and more
  
• Tips to adjust sleep routines with confidence—and avoid burnout
  

👉 Download the Sleep Regression Solution Guide and feel confident no matter which regression shows up next.

​Sleep regressions are tough—but they’re temporary. With the right support, your little one can get back to restful, independent sleep—and so can you.
You don’t have to guess your way through this. I’m here to help you every step of the way. 💛
— Erin, B.A. Psychology, Certified Pediatric Sleep Consultant, Infant Mental Health, Integrated Feeding Specialist