<prompt> Unilateral undescended around ?2 months of age6 months of age12 months of age14 months of age  <response>: Ans. is c i.e., 12 months of age Definitive treatment of the undescended testis should occur before I year of age. - Cambell Urology Sabiston also suppos the above statement Note Bailey writes completely different timing for orchipexy, so dont follow it. 