How should I dress my baby to sleep in summer?

Research shows a clear link between overheating and an increased risk of sudden unexpected death in infancy, so it is important that parents and carers know how to dress baby for sleep.

How should I dress my baby to sleep in summer?

Babies control their temperature predominantly through their head and face. This is why we recommend that you put baby to sleep on their back with head and face uncovered.

Always remember to remove head coverings for sleep and ensure baby is positioned with their feet at the bottom of the cot – and if you’re using sheets or blankets, make sure they are firmly tucked in to prevent baby from wriggling down and overheating.

Room temperature

Red Nose does not recommend a specific room temperature for baby’s sleep. This is because there is no evidence to show that maintaining a specific room temperature prevents sudden infant death.

As long as baby is put down to sleep on their back, and that baby is dressed appropriately for the room temperature – not overdressed or under dressed – with their head and face uncovered, you can feel reassured that you are protecting baby from overheating.

We don’t believe that it’s necessary to use a room temperature monitor, or to leave the heating or cooling on all night, as long as baby is dressed appropriately for the temperature of the room – not too hot, not too cold.

To check, feel baby’s tummy, which should feel warm. Don’t worry if baby’s hands and feet feel cool – this is normal.

If your baby shows signs of heat stress, such as flushed and clammy skin, remove some bedding or clothing and offer fluids such as breast milk for young babies or water for older children.

An oscillating fan positioned away from the cot can help during the hotter months. Fans circulate the air and also provide white noise for baby, which can help them sleep more soundly. Research has demonstrated that oscillating fans can help to reduce the risk of Sudden Infant Death Syndrome (SIDS) in some circumstances.

What should baby wear?

Dress your baby as you would dress yourself for the temperature of the room – comfortably warm, not too hot, not too cold.

The right sleepwear can help keep baby comfortable and safe. A good option is Bonds Wondercool – the only baby clothing approved by Red Nose for safer sleep.

In warmer weather, you can dress baby in a sleeveless and legless onesies, or just a nappy and singlet. For cooler weather, a full suit will keep baby warm.

If you are using a sleeping bag, select the TOG that matches the temperature of the room. Use the manufacturer’s guide, which usually comes with the packaging, to select the right TOG and underclothes. Also make sure your sleeping bag is safe – it should be fitted around the neck, and baby’s arms fully out of the bag.

For younger babies being swaddled or wrapped, we recommend lightweight, breathable fabrics such as muslin and cotton.

If you are using sheets and a blanket, make sure they are also lightweight and breathable muslin or cotton fabric. But never place soft items in the cot such as lambswool or overlays, as these increase the risk of overheating.

When dressing baby for sleep, remember to dress baby for the temperature of the room – comfortably warm, not too hot and not too cold.

Check out our Safe Sleep Advice Hub for more information about safe sleeping, or you can ask our Safe Sleep Educators a question.


Last modified: 27/1/22

Dressing babies for bed: the basics

Dress in layers
Dress your baby in layers of fitted clothing rather than just thick pyjamas. You can add or take away layers as the temperature changes.

No hats and beanies in bed
Babies cool themselves down by releasing heat from their heads and faces.

Babies can quickly overheat if they fall asleep wearing hats or beanies. So it’s important to keep your baby’s head uncovered during sleep. Headwear in bed can also be a choking or suffocation hazard.

Baby’s temperature
Your baby’s hands and feet might feel cool, but this isn’t a good indication of temperature. You can find out how hot your baby really is by feeling baby’s back or tummy.

Room temperature
It’s best to adjust your baby’s clothing rather than heating or cooling the room. But if you need to adjust the temperature of the room where your baby sleeps, use a heater or fan only when your baby isn’t in the room. Turn off the appliance before putting your baby in the room.

Never use electric blankets or hot water bottles to warm your baby during colder weather.

Getting too hot has been linked with sudden unexpected death in infancy (SUDI) including SIDS and fatal sleeping accidents. Your baby should be comfortably warm – not hot, sweaty or cold.

Baby wrapping

Wrapping helps babies settle for sleep, as well as stay in a safe sleeping position on their backs.

If you choose to wrap your baby, use lightweight cotton or muslin wraps.

Make sure the wrap doesn’t go above your baby’s shoulders or cover baby’s head, ears or chin. Wraps that are too high can obstruct your baby’s breathing and cause overheating.

Also check that there’s enough room for your baby to stretch their legs and that the wrap isn’t too tight around baby’s chest and hips. Wrapping a baby’s legs and chest too tightly can lead to hip and breathing problems.

Underneath the wrap, put your baby in a nappy and singlet in warmer weather. You can add a lightweight growsuit in cooler weather.

Babies can be wrapped from birth until they start showing signs that they can roll onto their tummies, usually around 4 months.

Baby sleeping bags

A safe infant sleeping bag can be a good option for dressing your baby for bed. A correctly sized sleeping bag is the best way to keep your baby’s head and face uncovered.

A safe infant sleeping bag also helps to:

  • reduce the risk of SUDI including SIDS and fatal sleeping accidents
  • stop your baby from rolling onto their tummy during sleep
  • contain your baby’s legs so they don’t hang out through the cot’s rails.

Check that it’s impossible for your baby to slip down into the bag and become completely covered. Red Nose recommends that you use a sleeping bag that has a fitted neck and armholes but no hood.

Some sleeping bags have a TOG (thermal overall grade) rating. This can help you decide which sleeping bag to use in different temperatures. But note that a TOG rating is just a guide. It isn’t a safety standard.

The rating or instructions that come with the bag can also help you work out what clothes to put on your baby underneath the bag. But these instructions are only a guide too, and you should always consider the temperature of the room where your baby sleeps.

If your baby uses blankets for bed, it’s a good idea to dress baby in enough clothes for warmth with a thin lightweight blanket. This way, if your baby wiggles out from under the blanket during the night, baby won’t be cold.

What should I dress my baby in at night when it's hot?

Always start by dressing your little one in a vest, as this is all they would need to wear if the temperature is above 25 degrees. You can then pop them in a swaddle or sleep bag to keep them cosy. If it's below 20 degrees, layer up your newborn with a sleepsuit.

How should I dress my baby to sleep in the summer with AC?

A long sleeve onesie with pants and a light sleep sack should be enough to keep your baby comfortable in these conditions, but you can add another layer or use a warmer sleepsack (2.5 tog) if you notice that your baby is not warm enough.

How can I keep my baby cool in the summer at night?

Open windows to try and get a breeze going. A fan directed against a wall will cool the room without blowing directly onto the baby. You could also hang a damp towel or sheet in front of the fan, not over it. This will keep the room even cooler.

Should babies sleep in long sleeves in summer?

If you can't avoid the sun entirely, Madden recommends dressing babies in protective clothing that covers their skin, like long sleeves, hats, and pants. “It's really important that the sun-protective clothing is breathable and lightweight so that your baby does not overheat,” she adds.