A 27-year-old primiparous woman with 28 weeks gestational age was admitted to our hospital with worsening shortness of breath. She was diagnosed with Ebstein's anomaly three years ago, but preferred to be left untreated. The patient was not cyanotic and her vital signs were stable. Her ECG showed incomplete RBBB and prolonged PR-interval. Blood tests revealed mild anemia. Observation of two-dimensional echo with color flow Doppler study showed Ebstein's anomaly with PFO as additional defects, EF of 57%, LV and LA dilatation, RV atrialization, severe TR, and moderate PH with RVSP of 44.3 mmHg. The patient then underwent elective sectio caesaria at 30 weeks of gestational age; both the mother and her baby were alive and were in good conditions.there was an increasing breathlessness in this patient so that there was an increasing need to take a decision for her pregnancy.Ebstein's anomaly is a complicated congenital anomaly. Medical treatment may be followed for many years in patients with mild forms of Ebstein's anomaly. Surgery should be considered if there is objective evidence of debasement such as significant enlargement of heart size, reduction of systolic function in echocardiography.