Blue Lizard's Australian Baby Sunscreen, SPF 30+ ($19) is made specifically for kids' sensitive skin and uses zinc oxide (10 percent) and titanium dioxide (five percent) for sun blockage. It received the EWG's good rating for its UVA protection and was listed in its bargain picks despite being nearly $20 . . . but it's arguably worth the few extra dollars because the "smart bottle" turns pink in UV light, alerting you to those pesky rays you can't actually see.