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1 Uterine Distension Theory: This theory speculates that the distension of the uterus causes the onset of labor.  Placental Aging Theory: This theory is that body recognizes the aging process of the placenta and when it is mature releases the hormones that start the labor process.
Magnesium Sulfate. Preterm labor is defined as labor that starts before 37 weeks of pregnancy. It occurs when the uterus contracts regularly and leads to changes in the cervix. Ten percent of women in preterm labor give birth within the next seven days. But for the majority of women, preterm labor stops on its own.