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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.
Stage 1: Early labor and active labor. The first stage of labor occurs when the cervix opens (dilates) and thins out (effaces) to allow the baby to move into the birth canal. This is the longest of the three stages of labor.