We use small fuzzis - Ben is about 10lbs now and we don't do them on the tightest setting. I think there is one popper left on the waist (so a bit lopsided
) and we put them on the second setting on the legs but I can't actually remember for sure without putting them on him! So it is a possibility that they are too tight, causing them to wick.
But I also find that the Fuzzi insert is not absorbent enough and we were getting leaks after an hour or two, so maybe as he has grown he is now weeing more? I add a little hemp insert to it and it seems to last much better but never as good as my 2 parters.
Mine are mostly old style too and have found the one new style one I have is very much bigger - not a good fit at all