From: "Karen M."

For the kitten, you really should be feeding a kitten food til 1 year.
Kitten foods contain more fat and protein than other foods, which they
need for growth. An all-life-stage food many times won't have as high
percentage of these nutrients as a actual kitten food, so I would stick
with that.

Karen, you're wrong. Haven't you been reading the all life stage food posts?
Any food whose AAFCO label states that it is for "all life stages" IS a kitten
food. "All life stage" foods have to contain nutrient levels appropriate for
kittens, not adult or senior animals.