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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.
If the mother cat is still present, but her milk supply is inadequate or if there is some other problem you can speed up the weaning process by mixing cat replacement formula with some solid kitten food. Kittens can start eating solid food when they are very young. Kittens start getting their teeth between 2-4 weeks of age and so you should start giving them small amounts of solid food when they are 3 weeks old.