In case of twins at 35 weeks of gestation, if the growth and development of the 2 fetuses are in accordance with the gestational week and there are no structural abnormalities, it is basically considered safe. The reason: 1, the fetus at 35 weeks of gestation is basically mature in the development of all organs, can cry and suckle after birth, the ability to survive, basically all can survive, may occur neonatal respiratory distress syndrome. 2, if it is a single chorionic membrane double amniotic sac twins, between 35-37 weeks of gestation can be considered to terminate the pregnancy, not recommended to look forward to after 37 weeks. In case of monochorionic monoamniotic sac twin fetus, termination of pregnancy between 32-34 weeks of gestation. In case of severe selective fetal growth restriction or twin fetus transfusion syndrome, termination of pregnancy is also done at 32-34 weeks of gestation. So twins can be gestated up to 35 weeks and are basically safe.