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.
The reasons vary (twin pregnancies are high risk pregnancies and are susceptible to more complications than singletons, often leading to early or premature births). The average gestation period for twins is 36 weeks, but it is not uncommon for twins to be born as early as 28 weeks, or as late as 40 weeks.