Monochorionic twin refers to a pregnancy with twins that share a placenta and have two amniotic sacs separated by two layers of amniotic membrane, which means that it is an identical twin that is very likely to be identical in gender. The risk of twins is significantly higher than that of single births, which can easily cause serious complications such as twin transfusion syndrome, selective FGR, anencephaly, etc. Thus, there is a risk of fetal growth and developmental arrest, and the possibility of difficult labor on the part of the mother is also significantly higher. In this case, it is advisable for pregnant women to do regular pregnancy checkups and also pay close attention to the changes in fetal movement to understand the growth and development of the fetus to facilitate delivery.