At 6 months old, I wouldn't worry about specific "kitten" food. All good cat food should be enough protein for a kitten.
I also feed a commercial raw (RadCat) mixed with canned. I have finally found some foods that both cats are eating consistently. They love the raw but will leave the canned if they don't like it and of course, neither one will eat what the other likes
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I have ended up feeding one a newer food called Nulo. My male cat was a little constipated on the RadCat (despite the added psyllium in it) and Fancy Feast (that is what he would eat). The Nulo has a few fruits in it (cranberry and pumpkin down the list a ways) but does have pea fiber and that has seemed to be the ticket for him and correcting the constipation. Emmy is happily eating Merrick Limited ingredient food. She will eat the duck, chicken and turkey (but alas doesn't like the Nulo). I pay $1.69/5.5 oz can for both of these foods which is not too bad for grain free. I am lucky to have several locally owned pet food stores in the area that carry a large variety of foods. I have fed the Hound & Gatos and mine will eat the chicken. It is also better priced that many. Mine have also liked the Wellness brand but it has changed a bit in the last year (I think the company was bought out) and they are a bit pickier about it.
Don't pay for "premium" food that is chock full of vegetables. Cats don't need veggies although a few certainly won't hurt. I refuse to pay the prices for those foods that have whole peas and chunks of carrots or a bunch of fruit. Fancy Feast classic...without the gluten...isn't that bad. It is mostly meat and some by-products but at least it is meat by-products and not a bunch of veggies and fruit.
Congrats on the kitten.
Susan