5 August 2026 · Veronica Chi
Business & Product Director · Mum of two
Baby Sleep Sack Guide Singapore: TOG Ratings, Air-Con and Sizing Explained
The sleep sack is what happens when the swaddle grows up: a wearable blanket that cannot be kicked off, ridden up, or draped anywhere it should not be. In Singapore it solves the one genuine cold problem we have — the air-conditioned night — without asking the fabric to do more than breathe. This is the guide to choosing one: TOG, sizing, and what goes underneath.
What does TOG mean, and what TOG for Singapore?
TOG measures thermal resistance — how much warmth a fabric holds in. A 2.5 TOG sack belongs to an English winter. Here, the working range is narrow and light: 0.2–0.5 TOG for fan-only rooms, up to around 1.0 TOG for a bedroom air-conditioned to 22–24°C. Bamboo complicates the number kindly — because it wicks, a bamboo sack of a given TOG feels less stuffy than the cotton equivalent, which is why ours sit in that light band and serve both kinds of night.
- 27–30°C, fan only — 0.2–0.5 TOG, short-sleeve onesie or nappy underneath.
- 24–26°C, gentle air-con — around 0.5–1.0 TOG, short- or long-sleeve onesie.
- 22–24°C, cold sleepers' air-con — 1.0 TOG, long-sleeve onesie underneath.
- Any night — judge by the chest and neck, never the hands; warm and dry is right.
How should a sleep sack fit?
Snug where it must be, generous where it may. The neckline should sit close enough that baby cannot slip down inside it — you should not fit more than two fingers between fabric and chest at the collar — while armholes hold without pinching. Below the chest, a good sack is a tent: room for legs to bend, kick and fall into their frog fold, which growing hips require. Size by weight and length rather than age, and when between sizes, take the smaller for the neckline's sake.
When do you move from swaddle to sleep sack?
At the first sign of rolling — usually two to three months — the swaddle retires and the sack begins. Arms come free, the fabric keeps the familiar held feeling, and bedtime survives the transition better than most parents expect. Our sacks run from six months into toddlerhood, in the same prints as the swaddles they succeed, which makes the handover feel less like change and more like graduation.
Why bamboo for a sleep sack?
A sack is worn eleven hours at a stretch, directly over sleeping skin, in a room whose temperature changes twice a night. Bamboo rayon's talent — carrying moisture away before it becomes damp — is exactly the talent required. It also washes like the swaddles: softer with time, unbothered by the daily machine, kind to the eczema-prone skin this climate cultivates.
One sack for the cot, one for the wash — the pair covers every night until the blanket years.
Questions parents ask
What TOG sleep sack for Singapore?
0.2–0.5 TOG for fan-only rooms, up to 1.0 TOG for air-conditioned rooms at 22–24°C. Heavier TOGs are made for winters we don't have.
When can my baby start using a sleep sack?
From when swaddling ends — at the first signs of rolling, around two to three months. Fit by weight and neckline snugness, not age alone.
What should baby wear under a sleep sack with air-con?
A long-sleeve onesie at 22–24°C, short-sleeve at 25–26°C. Check the chest ten minutes after settling: warm and dry is correct.