OK, quick question... I measured Ty and he weighs about 9kg, he's got a 41cm waist and a 36cm rise. I was looking at wild child nappies (for example) and their sizing is Small/medium- 3kg-7kg waist 28-58cm rise 33-39cm and for Med/ large- 6kg-15kg waist 28-65cm rise 39-46cm.

Which do you think would be best to get? I'm leaning towards a small/medium but it doesn't give a lot of room to grow. Yet if I get a large, I think it's going to swamp him. I'll look at other brands and see if there's anything that might be 'better'.