The right TOG for aircond rooms at 24-26°C, where most Malaysian families set the unit, is 0.2 or 0.5: a light sleep bag over one cotton sleepsuit, and nothing on top. At 22-23°C, go up to 1.0 TOG. At 27°C and above, or on fan-only nights, use 0.2 TOG over a short-sleeve bodysuit, or skip the bag. Measure the temperature at the cot, not on the remote, then check your baby’s chest or the back of the neck. It should feel warm and dry.
The rest covers why the UK’s 16-20°C advice doesn’t transfer to a Klang Valley condo, how to read a TOG label, where the cot and fan should go, and when a hot baby needs a doctor rather than a lower TOG.
TOG for aircond: the 22-28°C chart
There is no official chart that ties TOG to room temperature. The Lullaby Trust in the UK says outright that it can’t give one, because fabrics and layering vary too much. So this chart starts from manufacturer guidance (Love to Dream rates 0.2 TOG for 24-27°C and 1.0 TOG for 20-24°C) and fills in the whole degrees Malaysian parents actually set. Love to Dream has no 0.5 TOG, so the 0.5 rows are our interpolation, and the clothing suggestions are ours too. Treat the chart as a starting point and let your baby’s chest have the final say.
| Temp at cot height | Sleep bag (arms free) | Under the bag | Swaddled newborn |
|---|---|---|---|
| 22°C | 1.0 TOG | Long-sleeve footed cotton sleepsuit | 1.0 TOG swaddle over a short-sleeve bodysuit |
| 23°C | 1.0 TOG | Long-sleeve sleepsuit, or short sleeve if your baby runs warm | 1.0 TOG swaddle over a short-sleeve bodysuit, or 0.2 TOG over a long-sleeve footed suit |
| 24°C | 0.5-1.0 TOG | Long sleeve with 0.5; short-sleeve bodysuit with 1.0 | 0.2 TOG swaddle over a long-sleeve footed suit |
| 25°C | 0.5 TOG | Long- or short-sleeve sleepsuit | 0.2 TOG swaddle over a long- or short-sleeve suit |
| 26°C | 0.2-0.5 TOG | Short-sleeve bodysuit, or a light long sleeve with 0.2 | 0.2 TOG swaddle over a short-sleeve bodysuit |
| 27°C | 0.2 TOG | Short-sleeve bodysuit | 0.2 TOG swaddle over a sleeveless bodysuit or nappy |
| 28°C+ or fan only | 0.2 TOG or no bag | Short-sleeve bodysuit, or a light sleepsuit alone with no blanket | A single thin muslin wrap over a nappy, or skip swaddling that night |
Two rules sit on top of the chart. First, nothing over the bag: the UK’s National Child Mortality Database says extra bedding shouldn’t be needed, so if your baby’s chest feels cool, go up a TOG instead of adding a blanket. Second, swaddling adds warmth. The AAP warns that a swaddled baby is more likely to overheat, which is why the swaddle column runs a layer lighter.
What does TOG actually mean?
TOG stands for Thermal Overall Grade, a measure of how well a fabric insulates. The higher the number, the warmer the bag. Red Nose says sleep bags in Australia run from 0.2 to 3.5 TOG, and the NCMD gives the same range for the UK.
Three things the label doesn’t tell you:
- It rates the bag only. A 0.5 TOG bag over a long-sleeve footed sleepsuit is warmer than the same bag over a sleeveless vest. The chart above accounts for what goes underneath; the label doesn’t.
- It’s measured on flat fabric in a lab. Humidity, a bag that’s too big, or a baby lying on a waterproof mattress protector aren’t in the number.
- Brands rate their own products. There’s no shared standard, so one brand’s 0.5 can feel different from another’s. Fibre matters too: a breathable cotton mesh or bamboo knit feels cooler on a humid night than polyester wadding at the same rating.
Here is Love to Dream’s full scale, so you can see how much of it is irrelevant here:
| TOG | Brand’s room range | Use in Malaysia |
|---|---|---|
| 0.2 | 24-27°C | Most nights, most homes |
| 1.0 | 20-24°C | Strong aircond, hospital wards, hotels |
| 1.5 | 18-22°C | Rarely |
| 2.5 | 16-18°C | Almost never |
| 3.5 | Under 16°C | Cameron Highlands in December, maybe |
A 2.5 TOG bag in a gift hamper usually ends up in the cupboard. Ask for a 0.2 or a 0.5.
Why the 16-20°C advice doesn’t fit a Malaysian bedroom
Search for baby room temperature and the NHS and Lullaby Trust figure comes up first: keep the room at about 16-20°C. That figure was written for British homes, where the usual risk is heating and heavy bedding. Few Malaysian families run a bedroom at 18°C all night, and the TNB bill is one reason.
Other bodies don’t use a number at all. Red Nose, writing for a country with hot summers, says it does not recommend a specific room temperature for healthy babies and that it isn’t necessary to monitor the room or leave cooling on continuously, as long as your baby is dressed for the conditions. The AAP doesn’t give a room temperature either. Its rule is to dress your baby in one layer more than you’re wearing in the same room.
Strip away the numbers and the advice is the same everywhere. Don’t let your baby overheat, keep the head and face uncovered, and match layers to the room. A 25°C room with a cotton sleepsuit and a 0.2-0.5 TOG bag fits that. So does a 21°C room with a 1.0 TOG bag.
Overheating and SIDS: what the evidence says
The AAP, NHS and Red Nose all say the same thing: overheating is a known risk factor for sudden infant death. Babies release heat mainly through the face and head, Red Nose explains, which is why a covered head is a problem and why the AAP and NHS both say no hats indoors once you’re home from hospital.
The AAP’s signs of a baby who is too hot: sweating, damp hair, flushed cheeks, heat rash, fast breathing and a hot chest. If you see any of these, take off a layer or drop a TOG, then check again in 10-15 minutes.
In Malaysian homes, overheating usually comes from good intentions rather than the aircond. Common examples include a confinement-month baby in a beanie, socks, mittens, a tight bedung and a blanket on top, or a grandparent adding a selimut at 2am because the baby’s hands felt cold. If you need a line for the family: the NHS says cool hands and feet are normal, and it’s the chest you check.
How to check if your baby is too hot or too cold
Slide two fingers inside the collar at the back of the neck, or lay a flat hand on the chest under the sleepsuit.
- Warm and dry: the setup is right, whatever the hands feel like.
- Hot, sweaty, damp hair at the nape: remove a layer or go down a TOG. The Lullaby Trust and NHS both say to remove one or more layers.
- Cool to the touch at the chest (not just the hands): add a layer under the bag or go up a TOG. Don’t add a blanket.
Check at bedtime, when you go to bed, and at the first night feed. The 4am check matters most: an all-night aircond is coldest then, and a timed one has already switched off.
Where to put the aircond, the fan and the cot
The cot. Keep it out of the direct blast from the split unit. A cot under the unit’s louvres, or in their path across the room, can run noticeably colder than the rest of the room by early morning. Point the louvres up towards the ceiling, or set them to swing. The Lullaby Trust also says to keep the cot out of direct sunlight, so not under a west-facing window.
The thermometer. The number on the remote is a setting, and the unit reads the air around itself, high on the wall, not at the cot. Put a cheap digital thermometer on the cot rail for a week and note the reading at bedtime and at 4am. Dress for what you actually find.
The timer. Plenty of Malaysian families set the aircond to switch off at 4 or 5am to save on the bill, and a closed condo bedroom can climb several degrees by dawn. Choose the TOG for the warmest part of the night, not the coldest, because a baby who is slightly cool at midnight is easier to fix than one sweating at 6am. Better still, keep the unit on all night at 26°C rather than running it at 23°C on a timer.
The fan. The Lullaby Trust suggests a fan to circulate air, kept out of reach and not pointed straight at your baby. A ceiling fan on low is ideal. With a standing fan, angle it at a wall or the ceiling and keep the cord well clear of the cot. A 2008 US case-control study linked fan use with a lower risk of SIDS, especially in warmer rooms. The authors called it a possible extra measure on top of back-sleeping, and a study like this shows an association, not proof that the fan prevented anything.
Fan-only rooms. At 28-30°C with no aircond, the Lullaby Trust says just a nappy and no bedding is fine in hot weather. A short-sleeve or sleeveless cotton bodysuit is the most you’ll need.
What this looks like in a Malaysian week
- Weeknights in the condo, aircond on all night at 25°C, cot reading 25-26°C: a 0.5 TOG bag over a short-sleeve organic cotton bodysuit, or a 0.2 over a long-sleeve sleepsuit.
- Friday at the grandparents’ terrace house, fan only, 29°C: a sleeveless bodysuit, no bag, fan aimed at the wall. Leave the bedung in the drawer, whatever Atuk says.
- Hotel room or hospital ward with fixed central aircond at 21-22°C: a 1.0 TOG bag over a long-sleeve footed sleepsuit. Pack the thermometer.
Two bags, a 0.2 and a 0.5, plus four or five cotton base layers cover most Malaysian homes. One is always drying, and in the rainy season that can take a full day on a balcony.
Swaddle, sleep bag or just a sleepsuit?
Newborn to first signs of rolling: a light swaddle. An arms-up zip swaddle such as the Love to Dream Swaddle Up Bamboo Lite is rated 0.2 TOG for 24-27°C. A traditional muslin bedung works too if it’s a single thin layer with room for the hips to bend up and out, as the AAP describes. Our muslin swaddle guide compares both. Stop swaddling as soon as your baby shows any sign of trying to roll. The AAP says rolling usually starts at 3-4 months, but some babies try at about 2 months.
Rolling onwards: arms free, in a sleeveless sleep bag. The Bubba Blue Air+ in organic cotton mesh is a 0.5 TOG made for warm rooms, and a transition bag with zip-off wings lets you free one arm at a time. Our baby sleep sack guide covers fit: a snug neck, no hood, nothing weighted.
Under the bag: one breathable layer. A local option is the Twinkle Planet organic cotton zip sleepsuit for 24-25°C nights. For 27°C and fan-only nights, a sleeveless cotton bodysuit is enough. If your baby sweats through cotton, a moisture-wicking TENCEL Micromodal suit can feel cooler. For more on fibres and certifications, see our organic cotton baby clothes guide and the cotton and linen hub.
For the rest of the sleep setup, start at our sleep hub. If you’ve been told to put your newborn by a sunny window, read our post on jemur baby and jaundice first. And because back-sleeping every night means time on the tummy during the day matters more, our tummy time by age chart and the post on flat head in babies are worth a look.