TOG Rating Guide: How to Choose the Right Baby Sleeping Bag
Baby Central Australia · ergoPouch Guide
TOG Ratings, Answered
by ergoPouch
What does TOG actually mean? Which rating suits your baby's room? And how do you layer safely underneath? Our friends at ergoPouch answer the questions parents ask most when choosing a sleeping bag.
What Does TOG Mean on a Sleeping Bag?
TOG stands for Thermal Overall Grade — a measurement of how much warmth a fabric traps, originally developed for the textile industry and later adopted for baby sleep products. The higher the TOG rating, the warmer the bag. A 0.2 TOG bag is essentially a single layer of lightweight fabric for hot nights, while a 3.5 TOG bag is thick and built for cold rooms. TOG only measures the bag itself, not what baby's wearing underneath — which is why every TOG rating should be paired with a recommended sleepwear layer.
Jersey Sleeping Bag – 1.0TOG
Soft, breathable jersey cotton in a 1.0 TOG weight, suited to spring, autumn and mild rooms sitting around 21–23°C.
Which TOG Suits Which Room Temperature?
Room temperature — not the season on the calendar — is what actually determines the right TOG rating. As a general guide:
| Room Temperature | Suggested TOG | Typical Use |
|---|---|---|
| 24°C and above | 0.2–0.5 TOG | Summer, tropical or heated rooms |
| 21–23°C | 1.0 TOG | Spring, autumn, mild rooms |
| 18–20°C | 2.5 TOG | Standard Australian winter room |
| Below 18°C | 3.5 TOG | Cold winter rooms, unheated nurseries |
Because Australia spans everything from tropical summers to genuinely cold southern winters, there's no single "right" TOG for the whole country — it comes down to the actual temperature of your baby's room, ideally checked with a room thermometer rather than guessed from the weather outside.
2.5 TOG vs 3.5 TOG: What's the Real Difference?
These two are the most commonly confused ratings, since both are marketed as "winter" bags.
- 2.5 TOG suits most Australian winter nurseries sitting in the high-teens to low-20s (°C), especially in homes with some heating or insulation.
- 3.5 TOG is for genuinely cold rooms below 18°C, such as unheated nurseries in southern states during the coldest months.
If your nursery temperature sits somewhere in between, a 1.0 TOG bag with a warmer layer underneath is a flexible option while you assess what your room actually needs.
How to Layer Safely Underneath a Sleeping Bag
The TOG rating on the bag only tells half the story — what's underneath matters just as much.
- 0.2–1.0 TOG bag: a short-sleeve bodysuit, or a bodysuit plus lightweight pyjamas in cooler weather
- 2.5 TOG bag: a long-sleeve bodysuit and pyjamas or a sleepsuit underneath
- 3.5 TOG bag: a long-sleeve bodysuit and warm sleepsuit, without adding extra blankets on top
Cocoon Swaddle Bag – 1.0TOG
A swaddle-style sleeping bag at 1.0 TOG, designed for mild-room warmth with the ease of a zip-up bag.
A simple check: feel the back of baby's neck or chest, not their hands or feet, which are naturally cooler. Overheating is a known risk factor in infant sleep, so when in doubt, it's safer to underdress slightly and add a layer than to overdress.
Common TOG Mistakes to Avoid
- Stacking a high-TOG bag with extra blankets "just in case." The bag is designed to replace loose blankets, not sit underneath them.
- Using the same TOG bag year-round regardless of room temperature.
- Guessing room temperature instead of measuring it with a thermometer.
- Assuming TOG ratings are identical across every brand. Always check the specific product listing.
Frequently Asked Questions
What TOG rating is best for a newborn?
Newborns don't regulate temperature as well as older babies, so it's worth being slightly more conservative with layering in the early months. Match the TOG rating to your actual room temperature using the chart above, and check baby's neck or chest regularly rather than relying on age alone.
Can I use a 1.0 TOG sleeping bag all year?
Only if your baby's room genuinely stays in the 21–23°C range year-round, which is uncommon in most Australian homes without consistent heating and cooling.
Is a higher TOG rating always better for winter?
Higher TOG does mean warmer, but "better" depends entirely on your room temperature. Match the rating to the room, not to the season by name alone.
Should I dress my baby differently on nights the temperature changes a lot?
Yes — on nights with a big swing, adjust the layer underneath the bag rather than switching bags entirely. A singlet or muslin can be added or removed under the same TOG-rated bag.
0 comments