Kittens can drink human baby formula in desperate situations, but it is not acceptable for long-term diets due to lactose and an incorrect ratio of nutrients. The optimal nourishment for a kitten is its mother's milk. If that is unavailable, specially formulated milk replacements are the next-best option.
When feeding a kitten human baby formula, use a dose twice in strength of that indicated in the instructions. If human baby formula is not desirable, a temporary formula can be made by mixing one can of evaporated milk, 2 tablespoons of corn syrup and one egg yolk.
Alternative formulas should not be used on sick or fragile kittens, as the risk of diarrhea can lead to dehydration and death. When a kitten is about three to four weeks old, it can be fed solid food.