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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.
You can expect to have the same symptoms as with a singleton pregnancy, however, the signs and symptoms of twins happen earlier and can be more intense. Since 1980, twin births have increased 70 percent. In 2009, three of every one hundred babies born in the United States were multiples.