Vitamin D and Kid Sun Safety
Childhood is the highest-leverage window for both vitamin D synthesis and lifelong skin cancer risk. Sunburns before age 20 more than double lifetime melanoma risk. Kids need outdoor play (many reasons — vision, circadian, movement, mood, vitamin D), and they need reliable sun protection.
The lifetime cancer risk
5+ sunburns before age 20 doubles melanoma risk. A single blistering childhood sunburn triples it. These are the highest-leverage prevention opportunities in dermatology — and they are entirely modifiable through parenting choices about hats, sunscreen, and midday shade.
Family sun-smart routine
- Sunscreen SPF 30+ on exposed skin for extended outdoor time; reapply every 2 hours or after swimming.
- Wide-brim hats and UPF clothing for the beach, hiking, extended outdoor sport.
- Sunglasses — cumulative UV eye damage matters too.
- Shade seeking during peak UV (10 AM-2 PM in summer).
- Never seek sunburn, especially in children.
Doesn't sunscreen block vitamin D?
Real-world sunscreen use doesn't cause vitamin D deficiency in children (see our sunscreen page). Kids get plenty of incidental sun through daily play — often more than their parents realize. The AAP position: protect skin, and supplement vitamin D if needed (400 IU/day standard).
Practical dosing
- Infants (breastfed): 400 IU/day cholecalciferol drops from birth (see infants page).
- Toddlers to age 12: 600-1,000 IU/day, especially at high latitudes in winter.
- Adolescents: 600-1,000 IU/day (see teens page).
- Sunscreen and hat use is orthogonal to supplementation — do both.
Sunscreen for babies?
AAP guidance: under 6 months, avoid direct sun and use physical barriers (shade, clothing, hat, stroller cover). Sunscreen only if shade isn't possible; use small amounts of mineral (zinc oxide, titanium dioxide) on limited exposed areas. Over 6 months, standard broad-spectrum SPF 15+.