The authors present the use of computer-aided monitoring of pregnancy in case of twin. In our case one twin was threatened of intrauterine death. The frequency of antepartum death of one twin varies from 0.5%-6.8% of all twin deliveries. The underlying causes for antepartum death are multiple. It suggests that fetal growth retardation is due to competition for uteroplacental circulation and nourishment. In this case, the smaller twin was threatened of intrauterine death, because of intrauterine growth retardation, so the pregnancy was delivered on 32. week of gestational age by cesarean section.