Sleep & Daily Transitions · 4–5 months

Pause a moment before resettling naps

Babies this age often stir partway through a nap. Waiting a moment before you step in lets you see whether they settle on their own.

The moment

Your 4-month-old rolls onto their side in the crib and wakes up fussing 40 minutes into a nap.

What to say

At this age it matters less which words you use than that your voice is calm. Here is one way.

Wait a moment, then comfort

(Wait half a minute at the door. If the fussing builds:) "Hey, hey. You woke up and it surprised you. I'm here."

Get one of these a day for my child

A few days later it comes back and asks what you'd say. Free, no account.

What's going on

Over the first months, sleep settles into cycles with brief stirrings between them. Some babies fuss at those points and then drift off again if they're given a moment.

What it looks like day to day

What you might see around weeks 16–20: stirring and fussing partway through a nap, often while practicing rolling. Your job: pausing a moment to see if they resettle before placing a warm hand on their chest.

What the research does and doesn't say

What the research supports

The trials of bedtime routines and settling were done with babies from about seven months (Mindell 2009), so there is no direct test at four months. Pausing briefly to see whether they resettle is practice advice, not a research finding, and going straight in is just as reasonable.

Where it's your call

Two things that tend to help: patting their tummy gently in the crib while they settle, or humming the same sleepy song softly beside the crib. Neither is more 'correct'; use the one that fits you and this baby today.

Sources

Each one links to the paper. How we check them is on the sources page.

Zubler JM et al. (2022) · Pediatrics
Revised the CDC 'Learn the Signs. Act Early.' milestones to the ages at which at least 75% of children are expected to show each skill, so that a missing milestone is a reason to act rather than wait.
Expert consensus with literature review (AAP and CDC) · Milestone checklists for 2 months to 5 years
PubMed(opens in a new tab)
Mindell JA et al. (2006) · Sleep
Behavioral approaches to bedtime problems and night wakings, including positive bedtime routines and parent education, produced clinically significant improvement in the large majority of studies reviewed.
Systematic review (American Academy of Sleep Medicine task force) · 52 treatment studies
Paper(opens in a new tab)
Mindell JA et al. (2009) · Sleep
A consistent nightly bedtime routine, on its own, shortened time to fall asleep, reduced the number and length of night wakings, and improved mothers' mood within two weeks; controls did not change.
Randomized controlled trial · 405 mothers and their 7–36-month-olds
PubMed(opens in a new tab)
Mindell JA et al. (2015) · Sleep
The more nights a week a child had a bedtime routine, the earlier the bedtime, the shorter the time to fall asleep, the fewer the night wakings and the longer the sleep, in a dose-dependent pattern.
Cross-sectional survey across 14 countries · 10,085 mothers of children aged 0–5
PubMed(opens in a new tab)

Get one of these a day for your child's age.

A few days later it comes back and asks what you'd say, until the words are yours. Free, no account, and nothing leaves your phone.