I've just recently switched to a milled corn litter, because my cat was eating clay litter. After reading up on it I also got worried about all the potential hazards and had not really thought of it before -- dust they lick off their bodies while grooming, bits of clay stuck between their toes that they may eat while grooming and the dust they breath when scratching. I know my pan room was covered in a layer of clay dust and I got to thinking, ewwww, I am breathing this, then said Oh no the cats are too!!! They go in there more often in a day than I do, so... I love my milled corn (World's Best Cat Litter is the name) even though it's a bit more expensive, but it lasts a really long time and I'm impressed with the level of odor control it has. It clumps very well, too. And with enough water it melts away, so no worries about ingesting.

hope your kitten is doing well