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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.
Switch to Regular Cat Food. Mother cats need to continue to eat kitten foods until their kittens are completely weaned and done nursing. Kittens, for the most part, are weaned once they get to between 8 and 10 weeks old. Once the kittens are weaned, they're mature enough to eat solid foods 100 percent of the time -- and mom is ready to go back to eating cat food for adults, rather than for kittens.