Just because you don't have someone to look after you doesn't mean you can't be a naughty baby.
To increase the thickness of my diapers Daddy uses Abri-Let liners here, and they're awesome! Just one is fine, but I've been in up to three or four of them at a time and it was just as cliche as you'd imagine - massive bulk, couldn't walk and crawled around the house that day. >.<'
...And as you can imagine, you can't feel anything from the outside. D: Though it made for a comfy seat. ^_^