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 normal length of gestation for a single baby is around 40 weeks. However, gestation for twins, either identical or fraternal, is usually around 38 weeks. This shorter time is due to the increased demands on the motherâs body, and the inability of the babies to receive all the nutrients they need in utero.