When applying sunscreen, make sure you get all over, bottoms of feet, on the scalp (very important that you get babies there) even kids with hair should have sunscreen on the places where their hair parts. Also apply to the tips of the ears, hands, eyelids, etc. Make sure you slather a shot glass-sized amount over your child's body and enough to cover their face. Always reapply sunscreen after they swim, as even waterproof sunscreen doesn't always last long enough or stay on strong enough to complete with the sun's rays. And, even if your child is wearing a tee shirt over their suit, they should be properly sun screened beneath it as the shirt is only an equivalent of an SPF of 4 and won't protect them from all of the UVA and UVB rays.