That's awesome.
I wish I had a dad that would love changing me into my pull ups or goodnites or even regular diapers.
If you can get them, Huggies makes a size 8 in Huggies Complete protection and even Luvs makes a size 8 as well.
I can almost squeeze into the size 8 Luvs and size 8 Huggies but still have to modify them a bit and use some packing tape.
Although most kids should be able to easily fit into the size 8 diapers.
I wish I had a kid like yours as I would also love to change his diapers and even change him in public.
All boys that wet the bed should be diapered, whether in pull ups, goodnites or regulate diapers.