How Long Does a Sunburn Last? Pediatric Healing Timeline

Most sunburns heal on their own with time. A mild (first-degree) sunburn usually fades in about 3 to 7 days. A moderate burn that peels takes about a week. A blistering (second-degree) sunburn can take 2 weeks or more. Any sunburn on a baby under 1 needs a call to the doctor right away.

In our telehealth visits, sunburn is one of the most common summer worries parents message us about. Many are surprised by how fast a baby or toddler burns, sometimes after just a short time outside or through thin clothing. Below, a pediatrician walks you through the healing timeline by severity, what actually helps, what to skip, and the warning signs that mean it is time to call.

How long does a sunburn take to heal?

How long a sunburn lasts depends on how deep it is. Most heal in a few days to a couple of weeks without a doctor.

Sunburn is your skin's inflamed reaction to too much ultraviolet (UV) light. The deeper the burn, the longer it takes to heal. Here is the timeline by severity so you know what to expect.

Mild (first-degree) sunburn: about 3 to 7 days

A mild, first-degree sunburn (a surface burn that is red and sore, with no blisters) usually heals in about 3 to 7 days.

This is the most common kind. The skin looks pink or red and feels hot, tight, and tender. It may peel a little as it heals. Mild sunburns almost always get better at home with cool comfort care and staying out of the sun.

Moderate sunburn with peeling: about 1 week

A moderate sunburn takes about a week, and peeling can continue for 7 to 10 days.

The redness is deeper, and the skin may swell a bit. After a few days, the top layer peels as your body sheds sun-damaged cells. Peeling is normal. It does not mean the skin is infected. Let it come off on its own and do not pick at it.

Blistering (second-degree) sunburn: 2 weeks or more

A blistering, second-degree sunburn (a deeper burn that forms blisters) can take 2 weeks or more to heal, often 2 to 3 weeks.

Blisters mean the burn reached a deeper layer of skin. These burns hurt more and may swell. Some can leave a lasting change in skin color. A large or badly blistering burn may need a doctor, so call if you are worried.

What does the sunburn healing timeline look like day by day?

A sunburn follows a fairly predictable path: redness comes first, peaks within a day, then fades as the skin peels and repairs.

Here is how a typical sunburn unfolds:

• First few hours: Redness (called erythema) begins. Sunburn can be sneaky, so the skin may look worse over the next several hours.
• 12 to 24 hours: Redness, warmth, and soreness reach their peak. This is usually when a sunburn feels the worst.
• Around day 3: Peeling may start as the skin sheds damaged cells. This is a normal part of healing.
• About 1 week: Peeling can continue for 7 to 10 days, and any blisters usually begin to heal in that same window.

How long do sunburn blisters last?

Sunburn blisters usually heal in about 7 to 10 days. Blisters are a sign of a deeper, second-degree burn. The blisters themselves usually close in about a week, though the deeper burn can take 2 to 3 weeks to fully heal.

A blister is a small pocket of fluid that forms to protect and heal the skin underneath. Give it time and keep it clean. Watch a blistering burn closely, especially in young children, and call your doctor if it looks severe or infected.

How can I make a sunburn heal faster?

You cannot rush your skin's repair, but you can ease the pain and keep the burn from getting worse. No cream, spray, or remedy speeds up how fast skin actually heals.

The goal is comfort while your body does the work. These supportive steps are safe to try for children:

• Cool the skin. Apply cool (not ice-cold) compresses, or give a cool bath or shower. Gently pat the skin dry afterward.
• Give extra fluids. A sunburn pulls fluid toward the skin and away from the rest of the body, so offer extra water to help prevent dehydration.
• Moisturize. Use a gentle moisturizer, or one with aloe vera or soy, to soothe tight, sore skin. Avoid products with dyes or heavy fragrance.
• Treat pain safely. Ibuprofen or acetaminophen can ease pain. Follow the dosing on the package for your child's age and weight.
• Try 1% hydrocortisone cream. A short course of over-the-counter 1% hydrocortisone can calm sore skin. Skip the face and any broken skin.

How long does a sunburn last on a baby or toddler?

A baby's sunburn heals on the same timeline as anyone else's, but a young child's burn is more serious and needs closer attention.

Infant skin is thinner and more delicate than adult skin, so it burns more quickly, sometimes after only a short time outside. Babies also lose fluids and overheat faster, which raises the risk of dehydration and heat illness. In our summer visits, parents are often shocked at how fast a little one burned. It can happen through a hat or thin clothing, or from sun bouncing off water and sand.

Because of these risks, prevention matters most for the youngest children. Babies under 6 months should be kept out of direct and indirect sun. Shade, a hat, and lightweight clothing come first, with a small amount of sunscreen only when shade is not available. For more, see our guides on choosing and using sunscreen for kids and telling if your baby is too hot.

A baby under 1 with a sunburn needs to see a doctor. Call right away.

When should I see a doctor for a sunburn?

Call for a sunburn if your child is under 1, has a severe or blistering burn, or shows signs of dehydration, heat illness, or infection. When in doubt, reach out.

Most sunburns can be cared for at home, but some need a doctor or emergency care. Use these lists to help you decide.

Get care right away if your child has any of these:

• A sunburn and is under 1 year old
• Fainting, extreme weakness, confusion, or unusual sleepiness
• Signs of dehydration, such as very few wet diapers, no tears when crying, or a dry mouth
• A high fever, or a fever with skin that looks infected (spreading redness, warmth, or pus)
• A burn that covers a large area of the body

Call your doctor within a day if your child has:

• Severe pain that home care does not help
• Large blisters (bigger than half an inch), many small blisters, or blisters on the face
• Fever, chills, headache, or a general feeling of being unwell

Telehealth is a fast first step when you are worried and not sure what to do. It is not a replacement for emergency care. A baby under 1, or any child with severe blistering, a high fever, fainting, or signs of dehydration or heatstroke, needs an in-person or emergency visit right away.

How can I prevent a sunburn in the first place?

The best way to prevent sunburn is to combine shade, clothing, and sunscreen, and to be extra careful with babies and toddlers.

Sun protection works best in layers. Here is what pediatricians recommend:

• Under 6 months: Keep babies out of direct and indirect sun. Use shade, a wide-brimmed hat, and lightweight clothing that covers the skin.
• 6 months and older: Use a broad-spectrum, water-resistant sunscreen with SPF 30 or higher on any skin not covered by clothing.
• Reapply often: Put sunscreen on about 15 to 30 minutes before going out, and reapply every 2 hours, or after swimming or sweating.
• Seek shade: Limit time in direct sun during peak hours, usually 10 a.m. to 4 p.m. Use umbrellas, stroller canopies, hats, and sunglasses.
• Watch reflected sun: Water, sand, and even snow bounce UV rays back onto the skin, and clouds do not block them all.

Prevention protects your child now and for life. The effects of sun exposure build up over the years, so good habits early matter. For hot, sunny days, our guide on whether it is too hot to play outside can help you plan.

How Blueberry Pediatrics can help

A sunburn can feel scary, especially with a baby or on a weekend when your doctor's office is closed. Blueberry Pediatrics gives you around-the-clock access to board-certified pediatricians by message, phone, and video, so you can get a real answer fast.

We can help you tell a mild burn from one that needs to be seen. We will walk you through comfort care and tell you exactly when an in-person or emergency visit is needed. If your little one gets burned this summer, you do not have to guess alone.

Frequently Asked Questions

How long does a sunburn last?

A mild sunburn usually heals in about 3 to 7 days. A moderate burn that peels takes about a week. A blistering, second-degree burn can take 2 weeks or more. The answer to how long does sunburn last depends mostly on how deep the burn is.

How long do sunburn blisters last?

Sunburn blisters usually heal in about 7 to 10 days. Do not pop them. They protect the healing skin underneath and help prevent infection.

How long does a second-degree sunburn take to heal?

A second-degree (blistering) sunburn usually takes about 2 to 3 weeks to heal. It sometimes leaves a lasting change in skin color.

What does the day-by-day sunburn timeline look like?

Redness begins within a few hours and peaks at 12 to 24 hours. Peeling often starts around day 3 and can last 7 to 10 days, when blisters also tend to heal.

How can I make a sunburn heal faster?

You cannot speed up how fast skin repairs itself. You can ease the pain with cool compresses, extra fluids, gentle moisturizer, and ibuprofen or acetaminophen, and keep the burn from getting worse.

How long does a sunburn last on a baby or toddler?

The healing timeline is the same, but a young child's burn is more serious. A baby under 1 with a sunburn needs to see a doctor right away.

When should I call a doctor or go to the ER for a sunburn?

Call right away for any sunburn in a baby under 1, signs of dehydration or heat illness, a high fever, or a large or badly blistering burn. Fainting or confusion is a 911 emergency.

How do I prevent sunburn in kids?

Keep babies under 6 months out of the sun. For older kids, use shade, hats, clothing, and a broad-spectrum SPF 30 or higher sunscreen, and reapply every 2 hours.

Sources

• American Academy of Pediatrics, HealthyChildren.org. Sunburn: Treatment & Prevention.
• American Academy of Pediatrics, HealthyChildren.org. Baby Sunburn Prevention Tips.
• American Academy of Dermatology. How to Treat Sunburn.
• American Academy of Dermatology. Sun Protection for Babies.
• National Center for Biotechnology Information, StatPearls. Sunburn.
• U.S. Centers for Disease Control and Prevention. Sun Safety.

Medical Disclaimer

This article is for general information only and is not a substitute for medical advice from your child's doctor. Always talk with your pediatrician about your child's health and before starting any treatment. If you think your child has a medical emergency, call your doctor or 911 right away.