Hello all, adopting my first cat (a 4 month old male) next week who is currently being fed Purina One dry kitten formula. I want to switch him over to a quality wet food like Wellness, but don't know how switching a kittens food works. I read articles about a seven day transition, but also ones about exposing kittens to different types of food. Do I just feed him the new food right off the bat or use the transition method?