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Twins Come Early. Another difference between a twin pregnancy and a singleton pregnancy is that the babies tend to arrive very early. Full term for a singleton pregnancy is 40 weeks. If you carry twins to 40 weeks, bless you. It is not an easy task. Most twins never make it that far. Most twins arrive around 36 weeks.
Updated June 26, 2016. It's estimated that half of twins are born early, prior to 36 weeks gestation, which is almost a month before the standard 40 weeks gestation of a singleton baby. Triplets and other higher order multiples have an even greater chance of being born early.