I use Huggies preemie diapers. Since Kozanna doesn't have a tail, they slide right off, so I attach them to her harness with big diaper pins. I looped a piece of ribbon on each side of her harness and pin the diapers to the harness by the ribbons with the big diaper pins. Not hi-tech, but it works. I have some panties for Kozanna, but have trouble keeping them on her. She's a little bigger now, maybe five pounds, so I'll try the panties again one of these days. I think I'll have to attach them to her harness, too, to keep them on her. Anything is going to slide right off of her slick little backside!