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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.
By the time they are born, twins usually weigh around two and a quarter to three kilos (and are unlikely to weigh exactly the same as each other), so they at least double their weight in the last trimester. By contrast, single babies average three and a half kilos at full term.