Dress your baby just right for sleep
SleepSnug tells you exactly what to put your baby in based on tonight's room temperature — no guesswork, no overheating.
What SleepSnug does
Everything you need,
nothing you don't
Live room temperature
Uses your location or a manual reading to get the real overnight temperature — not a guess.
TOG-matched layers
Shows you a specific sleeping bag TOG and clothing combination, not vague temperature bands.
What-if explorer
Drag the temperature slider to see how the recommendation changes — plan ahead for cooler nights.
Age-aware
Recommendations adjust for your baby's age, from newborn to toddler, and for different sleep types.
Safety-first
Built on Lullaby Trust guidelines. Flags when conditions fall outside safe ranges and explains why.
Easy to share
Send tonight's recommendation to a co-parent or carer in one tap — no sign-up required.
How it works
Three steps to a safer night
Set the temperature
Use your phone's location to pull the overnight forecast, or type in your room thermometer reading directly.
Tell us about your baby
Choose their age, sleep location, and any special conditions. Takes about 20 seconds.
Get your exact recommendation
See the TOG rating, the clothing layers, and any safety flags — instantly, every night.
Quick reference
TOG by room temperature
SleepSnug refines this further based on your baby's age, humidity, and environment — but here's the baseline.
| Room temperature | TOG rating |
|---|---|
| Below 16°C | 3.5 TOG |
| 16–20°C | 2.5 TOG |
| 21–23°C | 1.0 TOG |
| 24–27°C | 0.2 TOG |
| Above 27°C | No bag |
Questions answered
Baby sleep & TOG, explained
The most common questions parents ask about dressing a baby for sleep.
What should my baby wear to sleep?+
What your baby wears to sleep depends on the room temperature. At 20°C a 2.5 TOG sleeping bag with a long-sleeve bodysuit is ideal. SleepSnug calculates the exact recommendation based on your room temperature, baby's age, and sleep environment.
What TOG sleeping bag do I need?+
TOG rating depends on room temperature: use 3.5 TOG below 16°C, 2.5 TOG for 16–20°C, 1.0 TOG for 21–23°C, and 0.2 TOG for 24–27°C. Above 27°C, skip the sleeping bag and use a nappy or light singlet only. SleepSnug gives a personalised recommendation based on your room conditions.
What TOG for 20 degrees?+
At 20°C, a 2.5 TOG sleeping bag is recommended. Pair it with a long-sleeve bodysuit for a newborn, or a short-sleeve bodysuit for older babies who run warmer.
What is a TOG rating?+
TOG stands for Thermal Overall Grade — it measures the warmth of a sleeping bag or duvet. Higher TOG = warmer. Baby sleeping bags typically range from 0.2 TOG (very warm rooms) to 3.5 TOG (winter).
What should a newborn wear to sleep?+
Newborns need one more layer than older babies as they can't regulate their temperature as well. At 20°C, dress a newborn in a long-sleeve bodysuit under a 2.5 TOG sleeping bag. Always avoid loose blankets for babies under 12 months.
How do I know if my baby is too hot or cold at night?+
Check your baby's chest or back of neck — it should feel warm but not sweaty. Cold hands and feet are normal. If your baby is sweating or their chest feels hot, remove a layer. SleepSnug helps you dress your baby correctly from the start based on your room temperature.
What temperature should a baby's room be at night?+
The ideal room temperature for a sleeping baby is between 16°C and 20°C (61–68°F). This range reduces the risk of overheating, which is a known risk factor for SIDS. Use a room thermometer to monitor overnight temperature and adjust your baby's layers accordingly.
What TOG for 18 degrees?+
At 18°C, a 2.5 TOG sleeping bag is recommended. Dress your baby in a long-sleeve bodysuit underneath. For newborns, you may add a light extra layer such as a short-sleeve vest beneath the bodysuit.
What TOG for 22 degrees?+
At 22°C, a 1.0 TOG sleeping bag is recommended. A short-sleeve bodysuit or just a nappy underneath is usually sufficient. Avoid overdressing — overheating is more dangerous than being slightly cool.
What TOG for 24 degrees?+
At 24°C, use a 0.2 TOG sleeping bag or a lightweight swaddle. Dress your baby in just a short-sleeve bodysuit or nappy only. Make sure the room is well ventilated.
What should my baby wear to sleep in summer?+
In summer when rooms are 24–27°C, use a 0.2 TOG sleeping bag with just a nappy or short-sleeve bodysuit. If the room exceeds 27°C, skip the sleeping bag entirely — a nappy and thin singlet is safer. Always prioritise keeping your baby cool to avoid overheating.
What should my baby wear to sleep in winter?+
In winter when rooms are below 16°C, a 3.5 TOG sleeping bag is recommended. Dress your baby in a long-sleeve bodysuit and a footed sleepsuit underneath. Avoid adding loose blankets — a high-TOG sleeping bag is safer and more effective.
Can my baby sleep with a blanket?+
Loose blankets are not recommended for babies under 12 months due to the risk of suffocation and overheating. A fitted sleeping bag (sleep sack) is the safest alternative — it keeps your baby warm without the risk of covering their face.
Is 25 degrees too hot for a baby to sleep?+
25°C is on the warmer side but still within a workable range. Use a 0.2 TOG sleeping bag and dress your baby in just a nappy or thin short-sleeve bodysuit. Ensure good airflow in the room with a fan. Check your baby's chest regularly — it should feel warm but not sweaty.
How many layers should a baby wear to sleep?+
A general guide is one more layer than an adult would wear. At a comfortable room temperature of around 20°C, that typically means a bodysuit plus a sleeping bag. The TOG rating of the sleeping bag replaces the need for multiple blankets or layers.
What if I don't have the exact TOG sleeping bag recommended?+
You can safely approximate the recommended TOG by adjusting the layers worn under a different bag. If the bag you own is lighter than recommended, add a long-sleeve bodysuit or footed sleepsuit underneath. If the bag is heavier, dress baby in just a short-sleeve bodysuit or nappy. SleepSnug's "Don't have this TOG bag?" panel shows you the exact safe combination based on what you own, your baby's age, and tonight's room temperature — and warns you when a bag is simply too warm for the conditions, regardless of what's underneath. Never use loose blankets for babies under 12 months.
When can babies use a duvet?+
Babies should not use a duvet or pillow until at least 12 months of age, and ideally closer to 18–24 months. Before then, a correctly rated TOG sleeping bag is the safest option. After 12 months, a lightweight toddler duvet (4 TOG or less) can be introduced.
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