The juvenile period for American Curls spans roughly from three months to about one year of age, during which the kitten undergoes remarkable physical transformation. By three months, the distinctive curled ears have usually begun to settle into their permanent shape, though the degree of curl may continue to refine subtly until around sixteen weeks. The cartilage that gives the ears their unique backward arc firms up during this window, and breeders often evaluate ear quality at this stage to determine show potential.
Growth during the juvenile phase is rapid but not as explosive as the first few weeks of life. American Curls are a medium-sized breed, and most individuals will reach close to their adult length by eight to ten months, though they may continue to fill out and add muscle mass until they are roughly two years old. Males tend to be slightly larger than females, typically settling between seven and ten pounds while females range from five to eight pounds.
Regular weight monitoring remains valuable during this stage, though weekly rather than daily weigh-ins are usually sufficient. Growth should be steady and proportional. A kitten that suddenly stops gaining weight, gains excessively, or develops a potbellied appearance despite adequate nutrition should be evaluated by a veterinarian to rule out parasites, metabolic issues, or dietary imbalances.