K.C.
We use Coppertone Waterbabies. It's SPF 50. I reapply if he's been sweating or gets wet. He tans extremely easily. Already a little brown baby and we've only had 4 days of nice weather. I do use a swim shirt for him. He won't keep a hat on. Most swimwear for little ones (if it's a decent brand) has some SPF protection. Carter's definitely does.