If you've checked the weather app, checked the monitor, and you're still standing over the cot at 6:45pm holding two different sleep sacks — welcome to winter with a baby.

Winter is when the "what do I dress bub in tonight?" question gets serious. The heater's been on and off all evening, the nursery feels warm right now, and you know full well it won't be at 4am. Nobody wants a cold baby. Nobody wants an overheated baby either. And honestly? At bedtime, with a tired baby on your hip, both feel like high-stakes calls.

So let's take the guesswork out of it. Here's the short version, straight from our sleepwear temperature chart:

Room temperature overnight	Sleeping bag	What goes underneath
Below 15°C	3.5 TOG	1.0 TOG romper + singlet
15–17°C	3.5 TOG or 2.5 TOG	0.2 TOG romper + singlet (with the 3.5) / 1.0 TOG romper + singlet (with the 2.5)
17–19°C	2.5 TOG or 3.5 TOG	1.0 TOG romper (with the 2.5) / 0.2 TOG romper (with the 3.5)
19–21°C	1.0 TOG or 2.5 TOG	1.0 TOG romper (with the 1.0) / 0.2 TOG romper + singlet (with the 2.5)
21–23°C	1.0 TOG or 0.2 TOG	0.2 TOG romper (with the 1.0) / 1.0 TOG romper + singlet (with the 0.2)

 

If the chart takes a second to click, our guide to reading the TOG chart walks it through.

Notice the "overnight" in that first column — that's doing a lot of work, and we'll come back to it. (And if your room lives in that bottom row, below 15°C, there's a heater trick for you in the FAQ.)

"Winter" isn't a temperature

Here's the thing about dressing a baby for an Australian winter: there's no such thing as an Australian winter. A July night in Brisbane can leave the nursery sitting at 20°C. That same night in Canberra, an unheated bedroom can drop below 12°C. Even in the same house, the north-facing nursery and the sleepout down the hall are having two completely different winters.

Red Nose — Australia's safe sleep authority — keeps it simple: dress your baby for the room they're actually in, and if you use a sleeping bag, choose the TOG that matches the room's temperature.

Worth noticing what they don't say. There's no magic "safe temperature" to chase — Red Nose is upfront that no perfect number exists. The whole game is matching the clothing to the room. Which means the real question isn't "what do babies wear in winter?" It's "how cold does this room actually get tonight?"

The 4am problem

We've written before about why babies wake cold between 3am and 5am — the room cools, sleep gets lighter, and baby's own body temperature drifts down the longer they're asleep. Winter is when all three of those hit hardest.

It's the classic winter trap: you dress your baby perfectly for the 7pm nursery, the heater cycles off, and by 4am they're awake and you're doing the bounce-and-resettle routine wondering what went wrong. Nothing went wrong — you just dressed them for bedtime instead of for the coldest hour of the night.

So when you look up your room on the chart above, use the overnight low, not the temperature when you zip them in. (If you're not sure what your nursery drops to, that's exactly what the Goldilocks thermometer figures out for you — it reads your room, predicts tonight's low from your local forecast, and shows you the dressing combo on screen. Chart, solved.)

Why the chart gives you two options

You might have spotted that most temperature bands have two combinations that land on the same warmth — say, a 2.5 TOG bag over a 1.0 TOG romper, or a 3.5 TOG bag over a 0.2 TOG romper.

That's not indecision. That's the washing pile.

Every parent knows the "correct" sleepsuit is frequently the one currently wet on the line. Two routes to the same warmth means you can work with whatever's clean — swap the bag, swap the layer underneath, same cosy result.

How to tell you've got it right

You don't need to wake them to check, and you don't need to trust their hands — cold hands and feet are completely normal for babies and don't mean they're cold.

Feel their back or tummy instead. Comfortably warm? You've nailed it. Hot, sweaty or clammy — or flushed cheeks? Too many layers; take one off. (More on this in our guide to telling if your baby is too hot or too cold.)

One thing that surprises a lot of parents: in winter, overheating is the sneakier risk, not the cold. Bundling up feels like the loving thing to do on a cold night, but safe sleep guidance is clear that getting too hot is the bigger danger. When you're stuck between two options, go lighter and check the tummy.

The winter rules that don't bend

A few things stay true no matter what the thermometer says:

• No beanies in bed. Ever. Babies offload heat through their head and face — Red Nose's advice is to always remove head coverings for sleep, even in the coldest rooms.
• No loose blankets or doonas over the top. A properly fitted sleeping bag can't be kicked off at 3am — that's the whole point of it. If the bag's not warm enough, go up a TOG or add a layer underneath instead.
• On their back, face clear — winter, summer, always.

Winter FAQ

What TOG should baby wear in a 16-degree room?

A 3.5 TOG bag over a 0.2 TOG romper and singlet — or a 2.5 TOG bag over a 1.0 TOG romper and singlet. Both land in the same warm zone; use whichever bag you own.

Our nursery drops below 15°C. Now what?

Two moves. Dress warm: 3.5 TOG bag, 1.0 TOG romper, singlet — the warmest combo on the chart. And bring the room up to meet it: TOG sleepwear is designed for rooms of 15–25°C, so when the Goldilocks predicts a low under 15 (you'll see the night light glow purple), set your heater to 15. That nudges the room back into sleepwear territory without overdoing it. We've covered the details — including why central heating with a hallway thermostat behaves differently to a split system — in using your heater and cooling with the Goldilocks.

Should I just run the heater all night?

Only if the room needs it. The Goldilocks is designed to help you dress baby right while relying less on heating — if the predicted low stays above 15°C, the right TOG combo does the job on its own. Below 15, heater set to 15 (see above). And if heating cycles on and off, dress for the low, not the peak.

Baby's hands are freezing — did I get it wrong?

Probably not. Cool hands and feet are just how baby circulation works. The tummy check is the one to trust.

Can I lay a blanket over the sleeping bag on a really cold night?

Tempting. Don't. Loose bedding and sleeping babies don't mix — step up the TOG instead.

Not too hot, not too cold

Winter dressing really comes down to one number — tonight's overnight low in your baby's room — and the chart above. If you'd rather not be squinting at both at 11pm, the Goldilocks thermometer and sleepwear guide does the whole thing for you: reads the room, predicts the low, shows you what to dress them in. And our TOG-rated organic cotton sleepwear covers the layers themselves.

Because a warm baby sleeps longer. And so do you.

New to TOG ratings? Start with What is a TOG Rating?