Our baby is the only one still in sleepe

Read the safe-sleep and child-sleep cards plus the Lullaby Trust dressing page. Here's the practical version.

First, the honest part

There is no age when a baby is "supposed to" be out of footed sleepwear (sleepers/footed pyjamas). It is not a milestone and it is not a sign your baby is behind. It is a fit, warmth and safety question with three checks — and buying the next size was the right move, because fit is one of the three.

The three checks that decide it

1. Fit: shoulders sit right, and the neck/arm openings are small enough that the head cannot pass through. A too-small sleeper that rides up over the chin is the problem, not the fabric.
2. Warmth: roughly one more thin layer than you are wearing, thin material, nothing else piled on. Check the chest or back of the neck — not hands or feet, which are unreliable. Hot or sweaty skin → take a layer off. Cold to the touch → add one. (Lullaby Trust · NHS)
3. What the baby is doing: can they roll onto their front? are they crawling or pulling to stand on the floor?

(1) What you already tried vs. what works better

Buying bigger sleepers — fine, keep them, but only if check 1 passes. The next size is a solution only if the neck still holds.

Better alternatives, in order of effort:

A 5-minute job, done tonight: dress your baby the way you'd dress them for the coldest part of today's day, then check the back of the neck. That's your number for the daycare room. If they're hot or sweaty, remove one layer — that's the instruction to hand over, not a fixed rule of thumb.

Script for the daycare teacher (screenshot this):
> "For naps today: [footed sleeper + no extra blanket] / [romper + socks, no blanket]. Sleep space is just the flat cot — no blanket, no soft toy, no bumper. Could you check the back of his/her neck when they lie down and again after 30 min, and text me `hot` / `fine` / `cold`? If the sleeper rides up past the chin, please take it off and use the romper."

Success in 24 hours: one nap where the neck check comes back "fine", the cot is bare, and you have not bought another set of anything. That is the whole goal.

(2) Constraints and the avoid list

Non-negotiable for the nap, at daycare and at home:

• Baby on their back for every sleep, day and night.
• Firm, flat, non-inclined surface, own cot, empty — no blanket, no duvet, no pillow, no soft toy, no bumper pads.
• Same room as you (own sleep space) for at least the first six months, but not the same bed.

Avoid:

• No socks under the sleeper if the sleeper is thick enough on its own — that's two layers in one spot. Socks, or the sleeper, not both. *(You listed both — this is the one to change.)*
• No hat indoors, and never any hat or loose item in the sleep space.
• No loose blanket "because it's a nap, not a night" — a daytime nap is a sleep, same rules.
• No sleep bag over a swaddle, and no loose bedding once the baby can roll.
• Never fall asleep on the sofa or armchair with the baby, including for a nap. If you feel yourself drifting, put the baby down in their cot first, before the cuddle or the feed. Alcohol or anything drowsy makes this more likely, not less.
• Don't buy powders, supplements, or anything from a marketplace "for sleep". Nothing at home changes how a baby sleeps safely — the cot and the routine do.
• Don't let this become a comparison project with the other daycare babies. Sleepwear size is not a development stage.

(3) Red flags — stop the DIY and get help

Call your local emergency number now, or go to the nearest emergency department:

• Lips, tongue or face blue, grey or very pale — in sleep or awake.
• Pausing or stopping breathing, or grunting/gasping noises while asleep, or a chin or neck pulled in.
• Hard to wake, floppy, or not feeding.

Same day, phone the pediatrician or your usual clinic:

• Under 3 months with a fever, or any fever with a baby who looks unwell.
• Skin hot and sweaty or flushed and very red and not settling after you remove a layer — overheating is a reason to call, not to keep adjusting sleepers.
• A baby who cannot free their own face after rolling onto the front, or who is rolling freely but you're not sure how they're positioned in the sleep bag. Bring your setup and say what you're seeing; the clinician decides about bags and rolling, not this reply.
• Weeks of the same problem: night waking every night for months, or naps that never settle, plus daytime collapse. That is a pattern to take in, not a clothing problem.
• Any question off a machine — a home monitor, a wearable "sleep score", a hospital monitor reading — is not something I can read for you, and a good number does not mean everything is fine. Bring the download to the appointment; the person who set the device reads the trace.

Handoff: your baby's clinician decides anything about rolling, bags, or your baby's own sleep. Tonight's version is yours: bare cot, back to sleep, one extra thin layer, neck checked.

Sources: Lullaby Trust "How to dress your baby for sleep" and safer-sleep pages (accessed today) · NHS safe sleep and "how to dress a newborn" · `references/child-sleep.md` safe-sleep rules (AAP/NHS/WHO, accessed 2026-09-02)