The 11-month sleep regression
Most "11-month sleep regressions" are actually the 3-to-2 nap transition. Here's how to tell.
Sleep · Regression
TL;DR
The "11-month sleep regression" is not a true biological regression. Sleep researchers don't list it among the universal regressions (4 months and 18 months). What looks like an 11-month regression is almost always the 2-to-1 or 3-to-2 nap transition. Symptoms: short naps, late naps, bedtime resistance, early waking. Fix: shift to 2 longer naps, push the morning nap later, hold bedtime steady. Adjustment takes 2 to 3 weeks.
Need a nap schedule for the new 2-nap routine? Use our free wake windows calculator.
This article is general sleep information aligned with pediatric sleep research. If your baby's sleep is concerning, talk to your pediatrician.
Is the 11-month regression real?
The honest answer: not really.
The 4-month regression is universal and biological — every baby goes through it because sleep architecture matures. The 18-month regression is partly a true regression (separation anxiety spike) and partly developmental.
The "11-month regression" isn't on the official biological regression list. What parents experience at 10 to 12 months is real disruption — short naps, bedtime fights, early waking — but the cause is usually a nap transition or a developmental leap, not a regression in the strict sense.
Not sure if this is actually the regression?
Five questions tells you: the regression you think you're in, an adjacent one, or one of the imposters (teething, illness, schedule problem). Each result comes with a 4-bullet action plan.
Identify the regression →The 3-to-2 nap transition (most likely culprit)
Between 6 and 9 months, most babies drop from 3 naps to 2 naps. Some babies hold onto the third nap until 10 to 11 months. When they finally drop it, sleep gets weird for 2 to 4 weeks.
What it looks like:
- Resisting one of the daytime naps
- Short naps (35 to 50 minutes)
- Bedtime resistance
- Early morning waking (5 to 6 AM)
- Overtired meltdowns at the end of the day
The 2-to-1 nap transition (less likely at 11 months, but possible)
Most babies don't drop to 1 nap until 14 to 18 months. But early dropper babies might attempt it at 11 to 12 months.
Signs the 2-to-1 transition is happening:
- Morning nap creeps later (10:30 AM, then 11 AM)
- Afternoon nap gets resisted or skipped
- Naps total 1.5 to 2.5 hours instead of 3+
- Bedtime drifts later because second nap is later
How to handle the 3-to-2 transition
Step 1: Recognize the pattern
If your baby has been on 3 naps and is now fighting the third (typically around 4 PM), it's time to drop it. Signs:
- Refusing to nap in the late afternoon for 3+ days in a row
- Bedtime is being pushed past 8 PM because of the late nap
- Total daytime sleep is dropping naturally
Step 2: Restructure to 2 naps
Aim for:
- Morning nap: 9:00 to 9:30 AM, 60 to 90 minutes
- Afternoon nap: 1:00 to 1:30 PM, 90 to 120 minutes
- Bedtime: 7:00 to 7:30 PM
Total daytime sleep: 2.5 to 3.5 hours. Total night sleep: 11 to 12 hours.
Get a personalized 2-nap schedule
Enter baby's morning wake time and get a sample schedule with both naps and bedtime.
Try the calculatorStep 3: Bridge with an early bedtime
The first 2 to 3 weeks of dropping a nap, bedtime needs to be earlier than usual. 6:00 to 6:30 PM is fine. Baby is tired, you're tired. Earlier sleep helps both.
Step 4: Hold the schedule
Once the new 2-nap schedule is in place, stick with it for 2 to 3 weeks even if a few naps are short. The body adjusts.
Other things happening at 10 to 12 months
Even if it's not a true regression, several real factors disrupt sleep around this age:
Walking practice
Babies who are working on standing or walking practice in their cribs at sleep onset. Pulling up, standing, falling down. Repeat.
Fix: Practice during the day. By night, baby's body wants to sleep more than practice. The phase usually lasts 2 to 3 weeks then settles.
Separation anxiety peak (around 9 to 12 months)
Object permanence + the realization that you exist when you're out of sight = bedtime crying because they don't want you to leave.
Fix: Strong, predictable bedtime routine. Confident "see you in the morning" exit. Avoid going back in for tearful pleas unless distress is severe. Consistency wins.
Teething (variable but often in this window)
The molars can come in around 12 to 18 months and they hurt. The incisors at 9 to 13 months can also cause sleep disruption.
Fix: Cold teether before bed. Pediatrician-approved infant Tylenol for severe pain. Talk to pediatrician.
Wonder Week leaps
Multiple cognitive leaps in the 10 to 12 month window (categories, sequences, programs). Some babies wake more or fight sleep during a leap.
How to tell what's actually going on
Track for 5 to 7 days:
- What time did each nap start and end?
- How long was each nap?
- Total daytime sleep?
- Bedtime and morning wake?
- How many night wakings, and what soothed them?
Then look for patterns:
- If naps are shrinking and bedtime resistance is the main issue: Nap transition.
- If sleep is fragmented all night without nap changes: Could be teething, illness, or anxiety. Check ears.
- If baby is also fussier in the day, off feeds, or pulling at ears: Ear infection check.
- If only mornings are disrupted (5 AM wakings): Bedtime is too late or last nap too long.
What NOT to do
- Don't sleep train during a nap transition. The schedule is changing. Sleep training a moving target doesn't work.
- Don't drop the schedule entirely. Even disrupted sleep should have structure.
- Don't add nighttime feeds back if baby was sleeping through. Hunger isn't the issue at 11 months for most babies.
- Don't extend the morning nap to "make up" lost sleep. Long morning naps push afternoon nap too late.
- Don't bring baby into your bed if it's not your normal practice. Hard to undo.
When to call your pediatrician
- Sleep disruption lasts more than 4 weeks without improvement
- Fever, ear-pulling, or other illness signs
- Significant change in eating, mood, or development
- Your gut is telling you something else is going on
The reassurance: this passes
Whether you call it a regression or a transition, the 11-month disruption resolves. Babies who were sleeping 11 hours straight at 9 months will likely be back to that within 4 to 6 weeks of the transition.
The work is short-term schedule adjustments and patience. The reward is a more mature sleeper who's done with the 3-nap stage and ready for the toddler nap pattern.