Knowing how to keep your baby comfortable at night — whether it’s a warm summer evening or a chilly winter one — is one of the biggest concerns for new parents. Babies can't regulate their body temperature as effectively as adults, so creating a safe and stable sleeping environment is essential.
In this guide, we’ll explain the ideal newborn sleeping temperature, signs your baby may be too hot or cold, and practical tips for keeping them cosy (or cool) all year round.
What Is the Ideal Room Temperature for a Newborn?
The ideal room temperature for a newborn is between 16°C and 20°C, according to NHS guidance. This helps reduce the risk of overheating while keeping your baby warm enough to sleep soundly.
You can check the nursery temperature using a room thermometer and adjust your baby’s sleepwear or bedding accordingly.
Signs Your Baby Is Too Hot or Too Cold
Newborns can’t tell us if they’re uncomfortable, but there are some signs you can look for:
Too hot:
- Damp hair or back of neck
- Flushed cheeks
- Rapid breathing
- Irritability or restlessness
Too cold:
- Cool hands, feet or nose
- Pale or mottled skin
- Unsettled or waking frequently
Checking the back of your baby’s neck or chest is more reliable than hands or feet, which often feel cold even when your baby is comfortable.
What Should a Newborn Wear to Sleep in Summer?
Dressing your baby for warm nights can be tricky. If the room is over 24°C, your baby may only need a short-sleeved vest or nappy and a thin, breathable swaddle.
Here’s a general guide for what a newborn should wear to sleep in the summer:
| Room Temperature | Suggested Clothing |
|---|---|
| 27°C+ | Nappy only or short-sleeved bodysuit |
| 24–26°C | Short-sleeved vest or lightweight cotton sleepsuit |
| 21–23°C | Sleepsuit and light swaddle or sleep bag |
| 18–20°C | Sleepsuit and 1.0–2.5 tog sleep bag |
How to Help Baby Sleep in the Heat
To keep your baby comfortable during summer nights:
- Keep the nursery shaded during the day to reduce heat build-up
- Use a fan safely to circulate air (not blowing directly on baby)
- Dress baby lightly and avoid synthetic fabrics
- Choose a breathable mattress and bedding — wool helps regulate body temperature naturally
Wool bedding is especially helpful as it responds to your baby’s body temperature, drawing excess heat and moisture away when they’re warm and keeping them cosy when it’s cooler.
How to Keep Your Baby Warm at Night
During colder months, knowing how to keep your baby warm at night without overheating is equally important.
Here’s how:
- Keep the room within the ideal 16–20°C range
- Use layers rather than thick blankets — a sleepsuit with a baby sleeping bag works well
- Place the cot away from draughts and cold windows
- Use wool bedding or a wool mattress protector for extra warmth and comfort
How to Keep a Newborn’s Hands Warm at Night
It’s normal for babies to have cool hands at night, and it doesn’t always mean they’re cold. But if their chest or neck also feels cool, you may need an extra layer.
To help, you can:
- Dress them in a sleepsuit with built-in mitts
- Use a swaddle or sleeping bag that covers their arms
Always avoid loose blankets or hats, as these pose safety risks during sleep.
Whether you're preparing for a summer heatwave or a crisp winter night, understanding your newborn’s sleeping temperature needs can give you peace of mind and help your baby sleep more soundly.
Wool bedding is a naturally clever solution for both hot and cold conditions. It regulates temperature, wicks away moisture, and creates a breathable sleep environment that supports safer, deeper rest.
For more guidance on healthy sleep for little ones, visit our Sleep Health & Advice hub.
