My DS appears to have inherited his Dad's metabolism rather than mine, and is long and lean with very slim thighs - he's 14 weeks and 11lbs. Before he was born I bought a stack of second hand bum genius nappies on a friend's recommendation. I have been trying them regularly since he was 7lbs (the minimum weight), and they always leak around the leg holes! 
I have also tried Little Lambs, which didn't leak, but the elastic made him sore around the thigh (although maybe I had the wrap on too tight?), and they also seemed very bulky.
Does anyone have advice on which cloth nappies will fit skinny thighs?