Baby wipes!

Umbrella or beach tent coated with UPF 50 since babies under 6mos cannot use sunblock, beach blanket, beach chairs

Long sleeve rash guard for baby, hat, sunglasses, and everything you'd normally bring in your diaper bag

Not until 6 months

@savvysmama, when can you do sunscreen?

Umbrella/pop up tent, sun hat, sunglasses, big blanket to put down. You can't really do sunscreen that young, so you will have to hang out in the shade for the most part