There's still six weeks to go until the due date for a single pregnancy, but if you're expecting twins they may arrive any time from now. Most singleton pregnancies are 38 to 42 weeks, but if you're carrying twins, 37 to 39 weeks is optimal. But more than half of twins are born before 37 weeks. Women expecting twins are at higher risk of high blood pressure, preeclampsia, placental insufficiency, gestational diabetes, and premature labor. That said, many women do go on to deliver twins naturally and many doctors will allow you to continue to 40 weeks, after which time an induction or cesarean might be suggested.
If the babies are in any position other than "head down," or the placenta is in an awkward position, such as near the neck of the uterus, a cesarean may be recommended. Some doctors prefer to deliver twins by cesarean because the second twin may run into difficulties during the delivery, particularly if she is not head down. Premature babies are more at risk of complications than those who go to full-term. A cesarean delivery ensures the babies are delivered quickly without having to go through hours of potentially stressful labor.
Sometimes, one twin is born vaginally and the other by cesarean. This often happens if the lower twin is in the "head down" position and the higher twin isn't.