Kallmann syndrome (KS) is a genetic disorder characterized by hypogonadotropic hypogonadism, anosmia, and infertility, occurring in approximately one in 50, 000 women. Here the authors present a unique case of successful ongoing pregnancy in an infertile KS woman with balanced reciprocal translocation [t(12;18)(q22;q21.1)]. The patient had a history of one sporadic miscarriage and low level of serum anti-Müllerian hormone, basal follicular stimulating hormone, luteinizing hormone, and estradiol concentration. She showed a good response to ovulation induction using human menopausal gonadotropin and chorionic gonadotropin and conceived in an in vitro fertilization and cryopreserved-thawed blastocyst transfer cycle.