I had along and skinny bub who weighed about the same at that age to (not that you can tell he was that small now lol)

I used Itti bitti boo's as they are a small size and not so bulky. I found lots of cloth nappies seemed overly big on him being so small..so I tried to stick to smaller fitting.

I used

Wildchild fitteds
Itti Bitti Boo's and delishes
Spunky butts lasted me forever
Buzy bee absolutely fanastic
Honey boys from Cerubs kiss are great for any baby and found them fabulous
Bubble bubs were (and still are) great aswell

I found Baby beehinds to big to be honest at that weight and I love my BBH now!

Good luck tanya - come over and chat in the general chatter...girls there will be only to happy to help ya