I'm not planning to expose K to the sun too much before 6 months when she can properly use sunscreen, but seeing as we'll be on a ship and traveling/sightseeing and it will be really hot and humid (especially with baby-wearing)... I think I should probably use sunscreen on her somedays if her skin is exposed?

What is the safest, best sunscreen you've used for your LO? Anyone else apply sunscreen before 6 months?