Are they meant to be worn underneath swim trunks, or can they be worn alone?
Is there someplace local I can purchase them, or is it best just to order online?
LMH1209:They make a couple of different kinds. I've generally used their swim trunks with a built-in swim diaper. I think they also make colorful ones that are more like Speedos. I'd say either of those types are meant to be used on their own, although you could put the baby Speedo ones under swim trunks. If you have more of a Speedo style but in white, rather than a color, I'd definitely put it swim trunks.
Ditto this. We have both the speedo-type and the trunks for J. At C's age, I would think the speedo one would work better. Up to you if you want to put something on over it.
They carry them at Buy Buy Baby in Rockville (trust me, they do, even though if you call and ask if they have swim diapers they'll say no).
TTC #2: BFP 12/17/11, m/c 1/7/12 and D&C 1/12/12
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we have this kind
so he wears them under his trunks (and I put a disp swim diaper on him too for good measure - which has saved me at least once!).