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Kittens are usually old enough to start eating solid foods when they're around 3 or 4 weeks in age, according to veterinarian J. Veronika Kiklevich of CatChannel.com. They're usually read to eat solid foods exclusively when they're between 6 and 7 weeks old.By then there is no need for them to nurse with mom.ittens are usually old enough to start eating solid foods when they're around 3 or 4 weeks in age, according to veterinarian J. Veronika Kiklevich of CatChannel.com. They're usually read to eat solid foods exclusively when they're between 6 and 7 weeks old. By then there is no need for them to nurse with mom.
Credit: Benjamin Torode Moment Open Getty Images. Orphaned kittens who are not able to nurse from their mothers can start eating moistened kitten food at about three weeks of age. Mother cats tend to wean their kittens by about eight weeks, at which point 80 to 90 percent of the kittens' food should be dry food. Kittens should eat food that is especially designed for kittens rather than adult cat food for the first year of their life because kittens require more protein than adult cats.