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1 The average duration of a regular pregnancy is 40 weeks. In a twin pregnancy. the average is 37 weeks. for triplets 34 and quadruplets 32 weeks.  The average birth weight for singletons is 7 lbs 7 oz. Average birth weight of twins is 5 lbs 5 oz. for triplets 4lbs and quads 3lbs.
About half of all twins and 90% of all triplets are born prematurely, before 37 weeks, and have a low birth weight of under 2.5kg. A baby who weighs more than 4kg (8.8lbs) at birth may be referred to as macrosomia, which means the baby is larger than normal.