Get a zip-up long-sleeve rash guard with a snap crotch.

Yes, they exist, and they’re worth the search.

A two-piece set with a long-sleeve rash guard and swim trunks that have a full snap or button crotch is the move. The rash guard covers the UV protection part (UPF 50+ is standard if you buy from a legit brand), and the snap crotch lets you change a diaper without removing the whole suit.

Avoid any one-piece swimsuit that zips at the back. Those are a nightmare for diaper changes. Also skip anything with a built-in diaper cover that doesn’t unsnap—you’ll end up wrestling a wet, sandy toddler.

Look for “two-piece swimsuit with snap crotch” or “rash guard with quick-dry snaps.” Land’s End, Primary, and SwimZip all make them. They aren’t cheap, but they last a season or two and save you from bathroom battles.

Your toddler won’t care about the style, but your sanity will thank you.