Baby Room Temperature & TOG Guide
Find the safe-sleep temperature range for the nursery and the bedding TOG to match the season, so baby sleeps warm without overheating.
A cool, steady nursery is a safer one
Overheating is a bigger risk than a slightly cool room, so aim for the middle of the 16–20°C range and dress baby for it rather than cranking the heat. A simple room thermometer takes the guesswork out; if the room drifts below the range on a cold night, a higher-TOG sack is safer than an extra blanket.
Once you know the target temperature, use the Sleep-Sack TOG Calculator for the exact under-layers, and the Baby Layering Guide for daytime dressing.
Frequently Asked Questions
What is the ideal room temperature for a sleeping baby?
Safe-sleep guidance puts the ideal nursery at roughly 16 to 20°C (about 61 to 68°F). That range is warm enough for comfort but cool enough to reduce the risk of overheating, which is linked to unsafe sleep. This tool returns that range and a target within it, nudged a little cooler in summer, so you can set a thermostat or decide whether to add or remove a layer.
How does TOG relate to room temperature?
TOG is a measure of thermal warmth used for sleep sacks and bedding. A warmer room needs a lower-TOG sack and a colder room a higher one: roughly a 0.5 TOG sack in summer, around 1.0 TOG in spring and autumn, and a 2.5 TOG sack for a cold winter room. This guide pairs the season with a starting TOG; pair it with the exact room reading in the Sleep-Sack TOG Calculator for the layers to wear underneath.
Can my newborn use a blanket or duvet?
Under about three months, and really for the whole first year, safe-sleep guidance is to avoid loose blankets, duvets, pillows, and cot bumpers, which carry a suffocation and overheating risk. A correctly-sized sleep sack or firmly-tucked thin layers keep a young baby warm without anything loose that can cover the face. This tool flags that for younger babies.
Is this medical advice?
No. This is general, informational guidance drawn from widely-published safe-sleep temperature and TOG ranges, not medical advice. Rooms, thermometers, and babies all vary. Judge warmth by feeling the back of your baby's neck or chest, and follow the current safe-sleep advice from your pediatrician or health service.
Informational only, based on widely-published safe-sleep ranges and the details you enter — not medical advice. Follow current safe-sleep guidance and consult your pediatrician with any concern.