Cats have delicate digestive systems. One of the best kinds of kitten advice you'll ever get is to start them off with a nutritious "human grade" cat food right from the start and keep feeding them that same food until they're adults. Any kitten or cat will thrive being fed the same diet consistently, along with occasional cat treats. You may have to experiment until you find out what your kitten likes to eat, so get a few sample packs from wherever you're going to get your food and see what they prefer the most.