Sunburn in Children: What to Do and What to Avoid

Key takeaways

• Cool, hydrate, cover. Move the child out of the sun, cool the skin with a cool (not ice-cold) shower or damp cloth for about 15 minutes, give plenty of fluids, and keep the burnt skin covered until it has fully healed.
• Sunburn appears late. Redness usually peaks 12–24 hours after exposure, so skin that looks only slightly pink at the beach can look far worse at bedtime.
• Never use ice, butter, oils or greasy creams on fresh sunburn, and never burst blisters.
• Call a doctor for blistering, a baby under one year with sunburn, fever, dizziness, vomiting or confusion — those can be signs of heat exhaustion or heatstroke, not just burnt skin.
• Prevention beats treatment: shade between 11am and 3pm, clothing and a hat, and a generously applied high-SPF sunscreen reapplied every two hours.

Children’s skin is thinner and far more vulnerable to ultraviolet (UV) radiation than adult skin, and sunburn in childhood is strongly linked to skin cancer risk decades later. The good news is that a mild sunburn is manageable at home if you act quickly and avoid the folk remedies that make it worse. Here is what to do, what to skip, and when to get medical help.

How to treat sunburn in a child, step by step

1. Get out of the sun immediately — indoors or into deep shade. Burnt skin keeps absorbing UV, so the damage continues while the child is still outside.
2. Cool the skin. A cool shower, a cool bath, or a cool damp flannel held against the area for around 15 minutes. Repeat if it helps. Cool means comfortable, not shivering.
3. Rehydrate. Sunburn draws fluid to the skin surface and children dehydrate faster than adults. Offer water regularly, and milk or diluted juice for younger children.
4. Moisturise gently. Once the skin is cool and dry, a light, fragrance-free after-sun or aloe-based moisturiser reduces tightness and peeling. Apply with a soft touch, not a rub.
5. Manage the pain. Age-appropriate paracetamol or ibuprofen, dosed strictly per the packaging or your pharmacist’s advice, helps with the burning ache and lets the child sleep.
6. Keep it covered. Loose cotton clothing over the burnt area, and no further sun exposure on that skin until it has fully healed — which can take a week or more.

What to avoid

When to see a doctor

Most childhood sunburn is superficial and settles within a few days. Seek medical advice the same day if you see any of the following:

• Blistering, or large areas of skin affected
• Sunburn in a baby under one year old
• Fever, chills or shivering
• Headache, dizziness, nausea or vomiting
• Unusual drowsiness, confusion or a child who is difficult to rouse
• Signs of infection later on — increasing pain, swelling, pus or spreading redness

Sunburn and heat illness often arrive together. The NHS treats confusion, a very high temperature, fast breathing and a child who does not improve after 30 minutes of cooling as a medical emergency, not a skincare problem.

Why children burn faster than adults

Three things stack against a child on a summer day. Their skin has less protective melanin and a thinner outer layer, so a given UV dose does more damage. Their body-surface-to-weight ratio is higher, so they overheat and dehydrate faster. And they simply spend more hours outdoors, often on high-reflection surfaces — water reflects UV, sand reflects UV, and snow reflects the most of all.

UV intensity also rises by roughly 10–12 % for every 1,000 m of altitude, which is why a mountain walk in the Alps burns children who never burn at home. Clouds are not protection either: a large share of UV passes straight through light cloud, and the classic ‘overcast day’ burn is one of the most common holiday injuries.

Preventing sunburn: what actually works

• Shade in the middle of the day. Between roughly 11am and 3pm the UV index is at its highest across most of Europe. Plan swimming and play around that window, not through it.
• Clothing first, sunscreen second. A long-sleeved rash vest, a wide-brimmed hat and wrap-around sunglasses do a job sunscreen cannot: they never wash off or get missed.
• Babies under six months stay out of direct sunlight entirely — the standard NHS guidance, because their skin is far too sensitive for prolonged exposure.
• Apply enough sunscreen. Most people apply half of what the SPF rating assumes. Use a generous layer, and apply it 20–30 minutes before going outside.
• Reapply every two hours — and immediately after swimming, towelling, or heavy sweating, even with water-resistant products.
• Do not forget the misses: ears, the tops of feet, the back of the neck, the scalp parting, and the strip of skin under swimwear straps.

Sun protection and insect protection on the same day

Summer evenings mean both UV and mosquitoes, and the order matters: sunscreen goes on first and is allowed to absorb, then insect repellent goes on top. Doing it the other way round can dilute the repellent film. We cover the timing in detail in our guide to using sun cream and insect repellent together.

How incognito® helps

For families who want one bottle instead of two, our Mineral Sunblock & Insect Repellent SPF30 combines mineral UV protection with our plant-based active, PMD (Citrepel®) — the DEET-free active recommended against both mosquitoes and ticks. It is vegan, biodegradable and made in the UK. Always follow the label for age suitability rather than any general advice you read online, including ours.

If the sun has already won, our Natural Aftersun & Moisturiser is a light, fragrance-simple lotion for calming hot, tight skin after a long day outdoors. We compare it with conventional aftercare in natural aftersun vs regular aftercare, and if your child’s ‘sunburn’ is itchy and bumpy rather than simply red, it may be worth reading about sun allergy and polymorphic light eruption instead.

What to expect over the next week

Redness peaks at 12–24 hours and fades over three to five days. Peeling usually starts on day four or five and is normal — resist picking it, since the new skin underneath is unprotected and easy to re-burn. Keep moisturising through the peeling phase, and keep the area covered outdoors for at least a week after that.

FAQs

What should I put on my child’s sunburn?
Cool the skin first with cool water or a damp cloth for around 15 minutes, then apply a light, fragrance-free after-sun or aloe-based moisturiser. Avoid butter, oils, petroleum jelly and ice.

How long does sunburn last in a child?
Mild sunburn usually peaks at 12–24 hours and fades within three to five days, with peeling around day four or five. Blistered sunburn takes longer and should be assessed by a doctor.

When should I take my child to a doctor for sunburn?
Go the same day if there is blistering, a large burnt area, a baby under one year old, fever, vomiting, dizziness or confusion. Confusion and a very high temperature are emergency signs of heatstroke.

Can I put after-sun on a baby?
Check the product label for age suitability and speak to a pharmacist or GP first. NHS guidance is to keep babies under six months out of direct sunlight altogether rather than relying on products.

Does sunscreen stop working after swimming?
Yes, largely. Even water-resistant sunscreens lose protection after swimming or towelling, so reapply immediately afterwards and then every two hours.

Can my child get sunburn on a cloudy day?
Yes. A large proportion of UV passes through light cloud, and reflection from water, sand or snow adds to the dose. Cloudy-day sunburn is very common on holiday.

Sources

• NHS — Sunburn
• NHS — Sunscreen and sun safety
• NHS — Heat exhaustion and heatstroke
• WHO — Ultraviolet radiation and health
• US EPA — Skin-applied repellent ingredients (DEET, OLE/PMD, picaridin, IR3535)

This article is general information, not medical advice. If you are worried about a child’s sunburn, heat illness or skin reaction, contact your GP, pharmacist or local emergency service. Always follow the instructions on the product label.

Written by the incognito® team.