whichtog.comsleep layer recommendations
What TOG for 12°C?
Baby sleeping bag and what to wear in a 12°C room
Very cold room at 12°C. Use a 3.5 TOG bag, worn over a long-sleeved bodysuit, a sleepsuit and an extra warm layer on top.
3.5TOG
Long-sleeved bodysuit
Sleepsuit
Extra warm layer on top
Below 13°C
Very cold — please try to warm the room toward 16–20°C.
Pick the bags you own and see the overnight forecast.
What TOG sleeping bag does a baby need at 12°C?
Very cold room at 12°C. Use a 3.5 TOG bag, worn over a long-sleeved bodysuit, a sleepsuit and an extra warm layer on top.
What should a baby wear to sleep at 12°C?
Dress them in a long-sleeved bodysuit, a sleepsuit and an extra warm layer on top, under a 3.5 TOG bag.
Why this TOG at 12°C?
John Lewis and Slumbersac recommend 3.5 TOG for cold rooms (Slumbersac below 18°C). The NHS and The Lullaby Trust's ideal sleep temperature is 16–20°C — below 13°C, safely heating the room is a priority.
Safe sleep checks
- Always place your child on their back to sleep.
- Check for overheating by feeling the chest or back of neck. Remove a layer if hot or sweaty.
- Do not put a hat on your baby indoors or for sleep — babies cool down through their head, and a hat can cause overheating.
- Do not use a sleeping bag with a cot duvet or loose blanket.
- These are general guides only — every child is different.
- Ideal room temperature for sleep is 16–20°C.
- Stop using a sleeping bag if damaged or if your child can climb out of the cot.