How to Keep Your Baby Cool During a Heatwave
When the UK heatwave arrives, it can suddenly feel like every parent is Googling the same thing at 2am:
“Is my baby too hot?”
If you’re worrying about baby sleep in hot weather, wondering what your baby should wear during a heatwave, or trying to keep your toddler cool without panic-buying every gadget online — you’re definitely not alone.
As a mum of three, I know how overwhelming hot weather with little ones can feel. But the good news is: keeping your baby cool during a heatwave is often much simpler than social media makes it seem.
Here’s what actually matters;
1. Focus on Keeping the Room Cool — Not Perfect
One of the biggest worries during a heatwave is baby room temperature.
The ideal room temperature for babies is usually around 16–20°C, but during UK heatwaves, that simply isn’t always realistic — especially in homes without air conditioning.
Instead of aiming for “perfect”, focus on making the room as cool and comfortable as possible.
Here are some simple ways to cool your baby’s room during hot weather:
Keep curtains and blinds closed during the day
Open windows early morning or late evening when temperatures drop
Use a fan to circulate air (but don’t point it directly at your baby)
Turn off unnecessary electronics that generate heat
Use lighter bedding and breathable sleepwear
You do not need to completely transform your nursery overnight.
2. What Should a Baby Wear During a Heatwave?
This is probably one of the most searched questions every summer — and for good reason.
In very hot weather, babies usually need far fewer layers than we think.
For baby sleep in hot weather:
Above 27°C: often just a nappy is enough
24–27°C: short-sleeved vest or just a nappy
21–24°C: lightweight short pyjamas or a thin vest
If you use a sleeping bag, switch to the lightest tog possible (often 0.2–0.5 tog in heatwaves).
A good rule:
If you feel hot, your baby probably does too.
Babies cannot regulate their temperature as well as adults, so overdressing is one of the biggest causes of overheating during hot weather.
3. Baby Sleep in Hot Weather: What Actually Helps
Heatwaves and baby sleep rarely go hand in hand.
And honestly? Sleep might be a little disrupted for a few nights — and that’s completely normal.
Instead of stressing about perfect sleep routines, focus on comfort.
Things that can genuinely help:
a lukewarm bath before bed
lightweight cotton sleepwear
cooler bedtime routines
blackout blinds to stop rooms overheating during the day
offering extra feeds if needed
And sometimes, the best thing you can do is adjust expectations temporarily.
Hot weather affects everyone’s sleep — including babies and toddlers.
4. Check Your Baby Properly for Overheating
Many parents check hands and feet — but these are often naturally cooler.
Instead, check:
chest
back of neck
tummy
Signs your baby may be too hot include:
sweating
damp hair
flushed cheeks
rapid breathing
restlessness
feeling hot on their chest or back
If your baby seems overheated:
remove layers
move somewhere cooler
offer feeds regularly
cool the room where possible
If you’re worried your baby is unwell or showing signs of heat exhaustion, contact a medical professional.
5. Don’t Cover the Pram With a Muslin
This one surprises a lot of parents.
Covering a pram with a muslin can actually trap heat inside and make temperatures rise dangerously quickly.
Instead:
use the pram shade
keep airflow moving
stay in the shade where possible
avoid being outside during the hottest parts of the day
If the pram feels hot to you, it’s likely much hotter inside for your baby.
6. Keep Babies and Toddlers Hydrated
During a heatwave, babies and toddlers may want feeds more frequently.
For breastfed babies:
feed responsively
they may naturally feed little and often
For formula-fed babies:
continue regular feeds
follow NHS guidance around hydration
Toddlers may need regular reminders to drink water throughout the day — especially if they’re distracted playing outside.
Cold fruit, ice lollies, watermelon, cucumber, yoghurt pouches and smoothies can all help little ones stay hydrated too.
7. What We Actually Recommend During a Heatwave
When temperatures rise, it’s easy to feel like you need to buy lots of products to keep your baby cool.
But honestly, a few simple essentials can make a big difference — without overcomplicating things.
Here are the heatwave products we genuinely find useful as parents:
A room thermometer to help monitor nursery temperature
Lightweight muslin cloths
Breathable cotton sleepsuits or vests
A lightweight summer sleeping bag (around 0.2–0.5 tog)
Blackout blinds to help keep rooms cooler during the day
A fan to circulate airflow (positioned safely away from your baby)
A reusable water bottle for toddlers to encourage regular drinking
Sun hats and UV-protective swimwear for outdoor play
A compact paddling pool or water play tray for keeping toddlers cool
The key is keeping things simple and practical.
You do not need dozens of gadgets or viral “must-haves” to survive a heatwave with little ones. Usually, the biggest difference comes from creating cooler sleep spaces, dressing babies lightly, staying hydrated and avoiding overheating during the hottest parts of the day.
