You can be quite cuddly and use the ergo. I'm about a size 18 now after DD2 and it fits fine without the waist extension. DH uses the waist extension cos he's about 130-ish kg and 6 foot 7.

We found the Ergo Sport better for cuddly people than the standard one.

Otherwise, the Close Carrier is an awesome sling - we both wear that with little origami involved