I adopted a 3 month old kitten from local animal shelter and wondering if feeding him adult cat food is OK.. I currently feed my 6 ¹/² year old diamond natural indoor dry formula which he has been eating for years and he has a great coat and is healthy. The shelter gave me the food that he has been eating I understand how to gradually transitions from one brand of food to another but unsure if feeding kitten adult formula is OK... My cats are indoor only..