Is "World's Best" litter safe for 4 week kittens?

Does anyone know if "World's Best" litter is ok for young kittens? I was using Feline Pine but they kept getting it in their eyes and caked around their noses... I switched to another litter which was pelleted and it just dissolves into dust and is very messy. I was going to try "World's Best" but it says it is clumping and I've heard clumping litter is bad for kittens. Is it safe?

I asked my vet about the clumping litter thing he told me that it is extremely rare that a kitten get sick and that in all his years as a researcher and vet he has never seen one case. He said it was one or two cases now being spread as fact. He is a very progressive vet too so I do believe him.
That withstanding WBCL is a very good litter and very safe. I don't use it for my multi cat home but when I had only one or two cats it worked well.