Zar may refer to: 1  Zar, Armenia, a town in the Kotayk Province.  Zar, Azerbaijan, a village in the Kalbajar Rayon currently controlled by the Nagorno-Karabakh Republic.
If you're carrying more than one baby, chances are good you'll deliver early. Twins are usually born around 36 weeks -- four weeks early. Triplets arrive at about 33 weeks, and quads often make their debut at 31 weeks.
Although the average length of gestation is classified as 38-42 weeks, it is reasonably uncommon for twin pregnancies to last until 40 weeks or beyond. The sheer lack of space for two babies to grow anymore is often the catalyst for an earlier labour.