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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.
The earlier in pregnancy a baby is born, the more likely the baby will have physical or mental disabilities. Preterm labor occurs in approximately 12 percent of pregnancies. The cause of preterm labor isnât always known, but there are certain risk factors that can increase the likelihood of going into labor early.