Cagey said:
You can always tell a kitten that's too early away from it's mother and littermates - it'll do the "pumping" thing with its paws when it gets or is trying to get comfy. It's a dead giveaway. Means they haven't matured or been socialized, and for some reason it's too late at that point. They never catch up. You either accept the behaviour and wait for it to get hit by a car, or turn it over to the SPCA for euthansia.
No way... all my cats have done that up to ripe old age. The behavior is "kneading", and it mimics the kneading a kitten does at the teat of the queen when nursing, to stimulate milk production. If your cat comes over and begins to knead on you, take it as a sincere compliment and sign of affection, and that your cat receives the type of security from you as it did from its own mother. Cats also "fluff" their bedding, just like dogs go in circles with theirs. I'm not sure, but I don't tie this to the similar kneading behavior. The fluffing is more of a "pull up" on whatever is there, and my own take is that it literally is fluffing up the spot (as opposed to just claw exercise). Cats can usually spot, and claim, a nice fluffy spot to sleep with little difficulty. And of course, cats do keep their claws in shape. No "sharpening" as some folks say, but removing the outer later, which sheds off. It took me a while to figure out, and then ask my vet about cats shedding claws. They do, and the new claw grows inside the old claw, which is shed like a snake sheds its skin. When the cat is "clawing" at something for no other obvious reason, its trying to toy with and dislodge the old outer claw, just like a human child will "wiggle" their loose baby tooth, helping it to be shed.
There is great subtlety to cat behavior, if you take the time to discern the nuances of it.