Feeding adult cat food to a kitten?

Bk Pt Asked: Feeding adult cat food to a kitten?

Could that make him sick? He's soup-pooping. Newly rescued, wasn't doing that before though, and I just recently started mixing in dry high quality Wellness adult cat food into his wet kitten food. Is that likely to be correlated?

Also, so long as he gets his essential nutrients and vitamins, it should be healthy to feed him people-food fish (e.g., in cans), right? Haven't had a kitten in a while. Thanks.