Slings owns the Kitty ping list. Hope someone on it can help you out. Never heard of a kitten not using a litter box.
I don’t know either. I have had cats before. They either went out, used the litter box, or both
I have a kitten about 7 months that suddenly decided that the cat bed on the windowsill was a good pee spot. I just moved it and put it away (after washing with bleach) and my problem stopped...knock on wood.