Babies can wear sunscreen starting at 6 months old. Before that age, both the FDA and the American Academy of Pediatrics recommend keeping infants out of direct sunlight entirely and relying on shade and clothing for protection. There is one exception: if shade and protective clothing aren’t available, you can apply a small amount of sunscreen to exposed areas like your baby’s face and the backs of their hands, even under 6 months.
Why 6 Months Is the Threshold
Infant skin is thinner and more permeable than adult skin, which means it absorbs substances more readily. Sunscreen ingredients, particularly chemical filters, can pass through that thin barrier and enter the bloodstream at higher rates than they would in older children or adults. A baby’s body is also smaller, so even a modest amount of absorption represents a proportionally larger dose. Their skin is more prone to irritation and allergic reactions as well, since the outer protective layer hasn’t fully matured.
The 6-month guideline has remained consistent across major pediatric and regulatory bodies. The AAP reaffirmed it as recently as August 2024.
What to Use Once Your Baby Is Old Enough
Choose a mineral sunscreen with zinc oxide or titanium dioxide as the active ingredient. These sit on top of the skin and physically reflect UV rays rather than being absorbed into it. Chemical sunscreens, which contain ingredients like oxybenzone, avobenzone, octocrylene, and homosalate, work by absorbing UV rays and converting them to heat. That absorption process is exactly what makes them less ideal for babies: the active ingredients can enter the bloodstream, and young skin is especially vulnerable to irritation from them.
Look for a broad-spectrum product with at least SPF 30. “Broad-spectrum” means it blocks both UVA rays (which cause long-term skin damage) and UVB rays (which cause sunburn). SPF 30 or higher does a good job against both, according to UCSF Benioff Children’s Hospitals. You don’t need to chase ultra-high SPF numbers. SPF 50 blocks marginally more UV than SPF 30, and the difference matters less than applying enough sunscreen and reapplying it consistently.
Skip products with added fragrance, which can trigger rashes on sensitive skin. If you’re trying a sunscreen on your baby for the first time, test a small dab on the inside of their wrist or behind their ear and wait 24 hours to check for redness or irritation before applying it more broadly.
How to Apply Sunscreen on a Baby
For babies older than 6 months, apply sunscreen to all exposed skin, but be careful around the eyes. The areas parents most commonly miss are the tops of the ears, the back of the neck, and the tops of the feet. Apply it 15 to 20 minutes before going outside so the product has time to bind to the skin. Mineral sunscreens technically work immediately on contact, but giving them time to set reduces the chance your baby will rub or wipe them off before they’re needed.
Reapply every two hours, or immediately after swimming, sweating, or toweling off. Babies are often in and out of water or drooling on themselves, so you’ll likely need to reapply more often than you think.
Protecting Babies Under 6 Months Without Sunscreen
For newborns and young infants, sun avoidance is the primary strategy. Keep your baby in the shade, whether that’s under a tree, an umbrella, or the canopy of a stroller. The NHS specifically warns against draping a blanket over a pram or pushchair to block sun, because it traps heat inside and can cause overheating.
Dress your baby in lightweight, long-sleeved clothing and a wide-brimmed hat. Fabric quality matters here more than most parents realize. A regular white cotton T-shirt has a UPF (ultraviolet protection factor) of only about 7, and when it gets wet, that drops to just 3. By comparison, clothing rated UPF 50+ blocks over 98% of UV radiation. If your baby will be outdoors regularly, dedicated sun-protective clothing is worth the investment.
Avoid going out during peak UV hours. In most locations, that window runs from roughly 10 a.m. to 3 p.m. in summer. If you do need to be outside with a young infant during those hours and shade isn’t available, applying a small amount of mineral sunscreen to exposed areas like the face and hands is the AAP’s recommended fallback.
Signs Your Baby Is Overheating
Sunburn isn’t the only risk. Babies lose the ability to regulate their body temperature faster than adults, and heat-related illness can escalate quickly. Watch for unusual irritability, pale or cool skin, a limp or floppy body, drowsiness, refusal to drink, and sunken eyes without tears when crying. These are signs of severe dehydration or heat illness that require emergency medical attention.
Less dramatic warning signs include flushed cheeks, rapid breathing, and fussiness that doesn’t resolve when you move to a cooler spot. If your baby seems uncomfortable in the heat, head indoors, remove extra layers, and offer a feeding to help with hydration.