Its a 1 year fellowship and there aren't a whole lot of programs out there that offer it. Louisville & Brigham are two that I know of. The specialty deals with such things as:
Pediatric vulvovaginitis
Ovarian masses, cysts and tumors
Sexual abuse
Pubertal aberration
Ambiguous genitalia
Menstrual disorders in teenagers
Pelvic pain
Vaginal agenesis (surgical/nonsurgical creation of neovagina)
Gynecological care for the pediatric adolescent patient
Pap smears
Birth control
Preventive gynecologic care