I think you are thinking of the phrase  the other way around , which does essentially mean the opposite, but in a specific way. The specific nature of the other way around is that it means that doing what you say in the opposite direction is correct, not necessarily the exact opposite.
Once kittens reach 4 weeks of age, their mother usually begins to wean them off milk and onto solid foods. Because the weaning process can take up to six weeks, purchase a small amount of kitten milk replacement formula and mix it into your kitten's food during his first two weeks with you.
Special considerations for kittens. Kittens need more food per pound of body weight than adult cats, and they will need more frequent meals. Use label recommendations as a starting point, and feed your kitten as much canned or raw food as she will eat until she is about four to six months old, in three or four meals a day.