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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.
Very low birthweight is defined as weighing less than 1,500 grams or 3 pounds, 5 ounces. Over half of twins (56.6%) met the definition of low birthweight and ten percent of twins born in 2009 were classified as very low birthweight. The average weight for twins was five pounds, 2 ounces (2,336 grams).