It is not necessary to use a sunscreen with an SPF greater than 30. Apply a creamy children's sunscreen a half-hour before going outside for the greatest effect. Use sunscreen whenever your child is outside and re-apply every 60 to 90 minutes. Sunscreens are not as waterproof as advertised, especially if children are in and out of the water frequently. Dry skin before re-applying.
Babies can burn even in indirect sunlight.
Dress your baby in lightweight, light-colored clothing, and always cover the head. Do not apply sunscreen to children under six months of age. Choose glasses with unbreakable plastic lenses. For children who won't wear sunglasses, baseball caps and sun visors are good options. Do not allow children to exercise outside for more than 30 minutes at a time when temperatures reach 90 degrees or more and humidity is high.