Sunscreen

We recently got our pool fixed and cleaned, it’s getting hotter and I want to start swimming in it. My son is 4 months old, I have got him a swimsuit and a swimming hat but I’m not sure about sunscreens to use, what brand do you use? I’m so scared about a reaction 😩 our pool doesn’t have any cover and it’s directly in the sun. I want to make sure I’m being smart when it comes to him, his skin is fairly light so I think he will burn easily