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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 One: The first state of labor begins with the onset of contractions that cause progressive changes in the cervix and ends when the cervix is fully dilated. This stage is divided into two phases: early (also known as latent), and active labor (the later part of this phase is referred to as transition).uring this time the cervix dilates from about 3 to 4 centimeters to 10 centimeters. With active labor, the baby generally starts to descend. Some women request pain (usually an epidural) during this stage of labor.