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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.
The twin birth rate in the United States is close to 1 in 31, a nearly 40 percent increase since the early 1980s. Thatâs because there are growing numbers of older moms (hormonal changes are believed to be responsible for the release of more than one egg at ovulation) and more successful fertility treatments. For most women pregnant with twins, gaining 24 pounds by week 24 is advised; a total weight gain of 35-45 pounds is generally desirable. 2  The twin who is developing closest to the exit (your cervix) is called Baby A. In 75 percent of cases, Baby A is head down before delivery; Baby B may be either head down or breech.