When it comes to swimsuits for kids, there are a few big factors to consider, including fit, the level of sun protection, and — of course — the style. Do you have a kid who loves frills and ruffles?

If you listen hard, you can probably hear the quiet yet distinct humming sound of handheld air pumps spanning suburbias from the East to West coasts right now — yep, it’s the sound of kiddie pools, ...