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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.
Things to Avoid During Pregnancy: Teratogens. A teratogen is anything that causes abnormalities in the development of the fetus if the mother is exposed to it during pregnancy. Examples of different types of teratogens include certain chemicals, medications and infections. Chemicals and medications It is difficult to determine whether a particular chemical or medication causes congenital abnormalities. This is because many women take medications during pregnancy, and most studies have to rely on the mother's memory of what she took while she was pregnant.