It is important to keep in mind that early sunburns in children do the most damage and can show up years later as cancer. While UVB rays burn the skin, UVA rays penetrate the skin and cause the damage. Buy sunscreen that protects against both UVB and UVA rays. If nothing else, keep in mind that sun damage is the main cause of aging in your skin. If you want your face to wrinkle and sag, making you look 60 when you are only 30, skip the sunscreen. AND remember that tanning beds are just as bad because they have UVA rays!
Have a happy summer but take care of yourself!