Around 4 weeks of age, healthy kittens can be introduced to solid foods. Start with a slurry or gruel of a mixture of formula and wet kitten food. (Take wet kitten food, and add spoonfuls of formula into the wet food and stir together until it takes on a gruel consistency.)
** You must supplement with bottle feeding until the kitten fully understands the new diet. Feed slurry via bottle, fingers, or spoon until the kitten gets the hang of it. Then move slurry to a shallow dish. Once the kitten is a confident gruel eater, transition fully to wet kitten food and introduce water.