Safe litter for 12-week-old kittens

You're right to pause on this — clumping litter and young kittens is a genuinely important question. The concern is that kittens under around 8 weeks old sometimes eat litter out of curiosity, and traditional sodium bentonite clumping litters can clump inside their digestive tract if ingested in quantity. At 12 weeks, most kittens have moved past the compulsive-eating-everything phase, but it's still worth using something safer while she's small. Before I point you toward something specific: is she using the box consistently so far, and do you have any requirements like low-dust or low-tracking — longer fur tends to carry litter around the house?

Good — consistent box use at 12 weeks is a great sign, and your instinct to check on the clumping question is sound. For a fluffy kitten this age, I'd point you to World's Best Cat Litter in the original clumping formula. It's made from whole-kernel corn rather than sodium bentonite, so if she does accidentally ingest a small amount it won't expand and harden internally. It clumps well enough to scoop cleanly, it's very low-dust which is better for her developing lungs, and the texture is fine-grained enough that most cats take to it immediately. It's also noticeably lower-tracking than clay litters, which matters with a longhair. One practical note: keep the litter layer on the shallower side for now — about 3cm — so she can get in and out easily and isn't digging around in large quantities of it.

Most recommendations suggest waiting until around 4 months, by which point kittens have generally stopped treating the litter box as something edible. Honestly though, many owners stick with a corn or wheat-based litter long-term — they work just as well for adult cats and some perform better on odour than mid-range clay options. If you do want to switch later, do it gradually by mixing the new litter in over a week or so. Cats — even young ones — can become particular about texture changes, and a slow transition avoids any box avoidance habits forming early on.

Yes — it comes in a 1.59kg bag which is a sensible size for a trial. For one kitten it'll last a few weeks, long enough to know whether she's happy with it and whether the tracking level works for your home. If it suits her, the larger bags are much better value per kilo. Worth checking current availability on Amazon UK as stock on the smaller size can vary, but it's generally well-stocked.