The Ideal Temperature Range
The recommended room temperature for baby sleep is 18-20°C (64-68°F). This range supports safe sleep by reducing the risk of overheating, which is a known risk factor for SIDS. Most adults find this temperature range slightly cool, which is a good sign — babies sleep better in a room that feels comfortable rather than warm.
How to Dress Your Baby for Sleep
The TOG (Thermal Overall Grade) rating on sleep sacks and blankets helps you choose the right warmth for your room temperature. Here is a simplified guide:
- Above 24°C (75°F): Just a diaper or a light onesie, 0.5 TOG sleep sack
- 22-24°C (72-75°F): Short-sleeve onesie with a 0.5-1.0 TOG sleep sack
- 20-22°C (68-72°F): Long-sleeve onesie with a 1.0 TOG sleep sack
- 18-20°C (64-68°F): Long-sleeve onesie with a 1.0-2.5 TOG sleep sack
- Below 18°C (64°F): Long-sleeve onesie, footed pajamas, with a 2.5-3.5 TOG sleep sack
Signs of Overheating
- Sweaty or damp hair
- Flushed or red cheeks
- Heat rash on the chest or back
- Rapid breathing
- Restless, fitful sleep
To check if your baby is too warm or too cold, feel the back of their neck or their chest — not their hands or feet, which are often cool. Their core should feel warm but not sweaty.
Signs of Being Too Cold
- Cool chest or tummy (not just hands and feet)
- Fussiness or difficulty settling
- Sneezing (a natural response to lower body temperature in newborns)
Seasonal Adjustments
In summer, use a fan to circulate air (not aimed directly at the baby) and opt for lighter sleep sacks. In winter, ensure the room is not overheated by radiators. A simple room thermometer placed near the crib gives you an accurate reading without guesswork.
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