Most lifetime UV exposure happens before age 18. A practical, age-appropriate plan from the AAP and AAD for sun-safe kids.
Childhood sun exposure is one of the strongest predictors of adult skin cancer risk. The American Academy of Pediatrics estimates that 25% of lifetime UV exposure happens before age 18 — and a single blistering sunburn in childhood roughly doubles melanoma risk later.
Babies under 6 months
Keep infants out of direct sun. Use shade, lightweight long sleeves, and wide-brim hats. The AAP suggests a small amount of mineral sunscreen on uncovered areas (face, hands) only when shade and clothing aren't enough.
Toddlers and older kids
Apply broad-spectrum SPF 30+ generously, 15 minutes before going out. Reapply every 2 hours or after swimming. Hats and UPF swim shirts dramatically reduce the surface area you have to cover.
Schedule pool, beach, and park time for before 10am or after 4pm when possible.
Teens
Tanning beds before age 35 increase melanoma risk by ~75% (WHO). Talk early — peer behavior in adolescence sets adult habits. Frame sun protection around skin appearance and athletics rather than fear.
Key takeaways
25% of lifetime UV happens before 18.
Shade + clothing first; sunscreen second for infants.
Using Kids and Sun Safety: An Evidence-Based Plan in practice
UV strength on this page follows solar elevation, ozone thickness, cloud cover, altitude, and surface reflection. Snow can bounce back most of the UV that hits it, water and sand far less, but all of them add to the dose skin receives.
Burn-time figures come from minimal erythemal dose (MED) values published for each Fitzpatrick skin type, divided by the erythemal irradiance at a given UV index. Personal MED varies by roughly 20 percent, so treat every number as a planning range.
Reapplication matters more than the SPF number. Reapply roughly every two hours outdoors and immediately after swimming, heavy sweating, or towelling, regardless of what the bottle claims.
Cumulative dose drives photoaging and long-term skin damage more than any single day. Small daily exposures on commutes, walks, and driving add up across a season.
Plan outdoor blocks around the peak UV window, usually between 10am and 4pm local time. Shade, UPF fabric, a wide-brim hat, and UV-blocking sunglasses reduce dose more reliably than sunscreen alone.
UV scale reference
The WHO scale groups UV 1-2 as low, 3-5 as moderate, 6-7 as high, 8-10 as very high, and 11 or above as extreme. Protection is recommended from UV 3 upward, and shade during the middle of the day becomes the priority from UV 8 upward.
A practical routine at moderate-to-high UV is roughly one ounce of broad-spectrum sunscreen for full-body coverage, applied 15 minutes before going out, then reapplied on schedule. Clothing, hats, and shade carry the rest of the load, especially for children and anyone with a history of easy burning.
Keep exploring DermUV
These pages give more depth around kids and sun safety: an evidence-based plan, from UV-scale reference material to definitions and city forecasts.