It is impossible to generalize the size of a twin’s stomach at full term; the uterine fundus can reach the lower edge of the rib cage in late pregnancy. Due to the different growth rates of the fetuses, the varying heights and weights of the pregnant women, and the different positions of the twin fetuses, the size of a pregnant woman’s belly at full term with twins varies from person to person, and is usually a bit larger than that of a pregnant woman with a single fetus of the same gestational age. The timing of delivery in twin pregnancies needs to be individualized and not always until full term. In uncomplicated twin chorionic twins, delivery can be delayed until 38 weeks of pregnancy, but not later than 39 weeks. Monochorionic dual amniotic sac twins without complications and comorbidities can be delivered under close monitoring until 35 to 37 weeks of gestation. In contrast, monochorionic monoamniotic bursa twins should be delivered at 32-34 weeks of gestation. In complicated twins, such as those with twin-to-twin transfusion syndrome, an individualized delivery plan is needed.