I've seen info about diapers for swimming in the pools- disposable swim diapers only hold poop, change immediately before and after swimming. Reusable ones dry quickly.

What about if you go to the beach for a few hours? Obviously this is a long way off since I live in New England and it's April! But I'm just confused how you do it. C will turn a year in july, and dh's grandmother lives near a family beach on a bay so I know we will take her.

Please explain!
Also do people ever do a reusable swim diaper (cloth?) over a disposable? I feel like that's what my nephew had to do at the Y.