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Most such terminations occur very early in pregnancy, during the first trimester, and many people restrict the term "miscarriage" to terminations during the second trimester. Miscarriages frequently occur so early that the woman is not even aware that she is pregnant. Some women are prone to miscarry; the term "habitual abortion" describes the condition where three consecutive pregnancies have terminated before 20 weeks' gestation.
A related matter is a very premature birth.
wikipedia.org dumped 2003-03-17 with terodump