How long does everyone suggest you keep a kitten on kitten food? What age are they ready to progress to a different type of food??? I have been feeding my girls Wellness for kittens for some time now and recently Arkose has been have liquid poops. They are 9months old and will be a year in May. I was told to keep them on the kitten food for an entire year. When I switched back to Science Diet for kittens to try and stop the liquid poops, they did but then they started throwing up. I am thinking that they are ready to quit kitten food and move on from it but I'd like some opinions first. Thanks!!!!!!!