for babies, children and young people with heart conditions 

Warm weather can be harder for everyone, and children with heart conditions may tire more quickly, become dehydrated faster, or struggle to regulate their body temperature. With heat weather warnings across the UK we’ve put together some practical tips for babies, children and young people with heart conditions. 

Why staying cool matters

Hot weather can make the heart work harder. Children with cardiac conditions may: 

• Sweat more or less than expected 
• Become tired quickly 
• Feel dizzy or faint 
• Become dehydrated more easily 
• Breathe faster when overheated 
• Need extra fluids or rest 

Babies and young children can become unwell more quickly in hot weather because they cannot regulate their temperature as well as older children and adults. 

Top tips for babies

Keep babies out of direct sunlight

• Babies under 6 months should be kept out of direct sunlight where possible.
• Use shade, parasols, sun covers and lightweight blankets.
• Never cover a pram completely with a blanket as this can trap heat.

Dress babies in light clothing

• Choose loose, lightweight cotton clothing.
• A single layer is often enough in very warm weather.
• Remove hats indoors or when in the shade.

Keep feeds regular

• Offer feeds more often during hot weather.
• Breastfed babies may want smaller, more frequent feeds.
• Follow your cardiac team’s advice if your baby has fluid restrictions.

Keep bedrooms cool

• Close curtains during the hottest part of the day.
• Open windows when it is cooler outside.
• Use a fan safely, not directly blowing on the baby.
• Check baby’s temperature by feeling their chest or back – hands and feet are often cooler.

Watch for Signs Your Baby Is Too Hot

Seek advice if your baby:

• Is unusually sleepy
• Has fewer wet nappies
• Is breathing faster than usual
• Feels very hot
• Is difficult to wake
• Is not feeding well

Top tips for older children and teenagers

Encourage regular drinks

• Encourage small, regular drinks throughout the day.
• Water is usually best.
• Frozen fruit, ice lollies and chilled snacks can help.
• Follow your cardiac team’s guidance if your child has fluid restrictions.

Plan around the heat

• Outdoor play is safest earlier in the morning or later in the evening.
• Avoid strenuous exercise during the hottest hours (usually 11am–3pm).
• Build in regular rest breaks
• Ensure your child’s school healthcare plan includes instructions around hot weather, call us if we can help with this 

Dress for the weather

• Wear lightweight, loose-fitting clothes.
• Light colours help reflect heat.
• Wear a wide-brimmed hat and sunglasses outdoors.

Keep skin protected

• Use high-factor sunscreen.
• Reapply sunscreen regularly, especially after swimming.
• Remember shoulders, ears, feet and the back of the neck.

Cool down safely

Try:

• Cool baths or showers
• Splash play
• Damp flannels on the neck or wrists
• Staying in shaded areas
• Fans or cool indoor spaces
• Keep blinds/curtains closed so indoor rooms stay cool 

Medication and summer heat

Some heart medications may increase sensitivity to heat or dehydration. 

Always: 

• Give medicines as prescribed 
• Store medicines safely and according to instructions 
• Ask your cardiac team or pharmacist if you are unsure about heat and medication side effects 

Do not stop or change medication without medical advice.

Remember

With some extra care and planning, children with heart conditions can enjoy summer safely. Every child is different. Follow the advice from your child’s cardiac team and adjust activities to your child’s individual needs.

Stay cool, stay hydrated, and enjoy the sunshine safely.

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