Toward the end of pregnancy, you may have extra scans to monitor the babies’ growth, since the ability of the placenta to provide oxygen can be reduced in a twin pregnancy. The volume of the fluid around each baby and their heart rates may be measured to check their well-being. Rarely, twins can develop in the same sac, known as monoamniotic twins. The main risk of this condition is that the cords become tangled, affecting the oxygen supply. The twins may have heart traces at the end of pregnancy and are delivered early by cesarean.
