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Background: The prevalence of diabetes is gradually increasing iin Korean. Moreover, the prevalence of pregnancy complicated by established diabetes seems to be increasing. During the past decades, advances in the diabetes care as well as advances in fetal surveillance and neonatal care, have continued to improve pregnancy outcome of women with diabetes. However, the incidence of congenital anomalies and spontaneous abortion as well as the perinatal morbidity in the women with diabetes are still higher compared to those of the general population. In this study, we estimated the prevalence of prepmncy complicated by both type 1 and type 2 diabetes and described the clinical characteristics and outcome of diabetic pregnancies. Methods: We analyzed data from four sources: 1) the mother(type and duration of diabetes, diabetic complication, preconceptional care), 2) obstetric out- come(method of delivery, obstetric complication), 3) neonatal outcome(birth weight, perinatal complication, congenital anomaly), 4) glycemic control during pregnancy, of women with pregestational diabetes delivered newborns at Samsung Cheil Hospital from 1992 to 1995. Results: During the study period, 34 singleton infants were delivered by the 28 women with diabetes. The diabetic pregnancy was present in 0.14% of total deliveries in Samsung Cheil Hospital. Patients with IDDM comprised 18%(6/34) of total diabetic pregnancies, 82%(28/34) had NIDDM. The duration of diabetes was 6.3 and 2.1 years in patients with IDDM and NIDDM, respectively. Two IDDM patients presented with proliferative retinopathy, and 3 background retinopathy, one in IDDM and 2 in NIDDM. Three patients with IDDM and 2 patients with NIDDM had diabetic nephropathy. Insulin requirement during pregnancy was increased about 2 times at the time of delivery when compared to the initial in women with IDDM and NIDDM. Preeclampsia was the most common obstetric compliications, which were more frequently observed in women with diabetic complications. LGA was present in 43% of women with NIDDM. One infant of mother with NIDDM, delivered at 28 weeks gestation, was died because of respiratory distress and one infant of mother with IDDM had a congenital heart disease(TOF). Only 3 patients scught for the preconceptional care before pregnancy. Conclusion: Pregnancies complicated by diabetes was more frequent than was expected, even though it was much less than the rates in North America. Only 9% of women with diabetes had preconceptional care before pregnancy. The importance of planned pregnancy and prepregnancy counseling should be addressed in women with diabetes of child bearing age.