The optimal time for male cats to develop fuller cheeks is usually between 6 and 8 months of age. During this period, male cats experience rapid testosterone accumulation as their testes develop, leading to fuller cheeks.

Developing prominent cheeks is a secondary sexual characteristic in male cats, closely related to genetics and hormone levels. To encourage a male cat to develop more prominent cheeks, you can appropriately postpone spaying/neutering surgery and provide him with a high-protein diet, such as cooked beef or chicken breast.