DS2 is 13.5 months, prob. weighs 25+ and has very chunky thighs. I'm using a combination of various nappies I've got in the drawer as well as the huggle I bought from flame recently - and they're all leaking. I use a kiwi quick flip (with bamboo booster) or a fluffle (+2 bamboo boosters) or even a bambineo+sandys+bamboo booster! The quick flip is a medium, seems a bit of stretch now to put it on him but I thought they were meant to be btp? The huggle I usually put a (you guessed it) bamboo booster in as well.
Could be the wrap? The only thing that seems to work all the time is the lovebums wrap in large (it's massive on him).Otherwise it's Nature Babies or Airflow large. Do they need to be really spacious on a night nappy? I've just bought quite a few more pockets, so didn't want to spend much at this point!