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Labor Signs (cont.)

Labor Signs Causes

No one knows exactly how labor starts. Some researchers think hormonal changes in the fetus cause the placenta to produce increased levels of a substance known as corticotropin-releasing hormone. This changes the balance of the mother's hormones, which have kept the uterus in a relaxed state. Once the process is triggered, the cervix begins to soften and thin. In most cases, contractions signaling the beginning of labor.

Medically Reviewed by a Doctor on 11/21/2014
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