The unintended birth of a baby before the 37th week of pregnancy, that is, not yet mature enough to live outside the womb, is called preterm birth. Births that occur before the 20th week of pregnancy are called miscarriages.
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The unintended birth of a baby before the 37th week of pregnancy, that is, not yet mature enough to live outside the womb, is called preterm birth. Births that occur before the 20th week of pregnancy are called miscarriages.