The redness of the prenatal period is a manifestation of preterm labor, generally 2-3 days after the redness of the contractions naturally start the labor and delivery, and generally the delivery also occurs 1 week before and after the preterm. If the amniotic fluid is normal, the placenta is not aging, the electronic fetal heart monitoring is normal, the fetal movement is normal, and there are no complications during pregnancy, you can expect to be admitted to hospital for delivery at 41 weeks. If the amniotic fluid index is less than 50 mm, the amniotic fluid is considered to be too small, so the delivery can be induced during hospitalization as soon as possible. If combined with gestational diabetes, gestational hypertension, thyroid function disease, etc., you should also be hospitalized at 40 weeks of pregnancy, these comorbidities are not easy to exceed the expected date of delivery, and it is not safe for mother and child to continue to wait for delivery.