Electroconvulsive therapy (ECT) is sometimes indicated for the treatment of psychiatric disorders during pregnancy. We describe a patient at 17-26 weeks gestation who took twelve ECT treatments for her bipolar disorder. At third ECT, we changed the induction agent from thiopental sodium to propofol due to her post-ECT delirium. At ninth ECT, there was a brief fetal heart rate deceleration associated with maternal ECT. The patient gradually improved and was discharged in remission after twelve ECT treatments. A healthy boy was born by cesarean section at 38 weeks of gestation. We report this case with a brief review of the relevant literature.