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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.
When they're around 4 weeks old, Mom will begin to wean her kittens. She'll begin teaching them how to hunt and will expect them to start eating solid food instead of suckling. She may growl at them when they try and nurse to encourage them to look elsewhere for food.