Grain free food for kittens?

Hello!
I was just wondering what other people think about using a grain-free diet such as Wellness CORE, Timberwolf Serengeti, or Nature's Variety Instinct for a kitten?
I am trying to choose the best kitten food but I was not sure if grain free/extra-high-protein is a better for a kitten or not.

higher protein is a great thing for kittens ... it depends on the formula and the kittens stomach ... most grain frees are formulated to meet guidelines for all life stages ... many have NOT been thru AFFCO feeding trials but the DO meet guidelines ( ie % s ) for kitten thru senior