Background: With the advancement of technology, twin pregnancies are no longer a rare occurrence. In twin pregnancies, some problems sometimes occur, such as fetal failure, fetal death, etc. For these problems, some doctors may recommend selective fetal reduction. So, is it possible to selectively reduce fetuses in twin pregnancies? Which fetus is better to choose? This will be elaborated on from various aspects below. Necessity of selective fetal reduction In twin pregnancy, the doctor may recommend selective fetal reduction if the following problems exist: 1. Fetal failure or death: If one of the fetuses fails to develop or dies