I bought the medium ones for my 26 lb 23 month old and they barely fit. They are slightly smaller than size 4 Pampers Cruisers. I just don't see how they are supposed to fit a 34 lb toddler so I would definitely recommend going up a size. Despite the tight fit, they worked well. We were in the pool for a few hours and as far as I could tell it wasn't dripping. My daughter didn't poop in it so I can't say how they would handle it.
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