Concerning the secondary outcomes, the application of real acupuncture in Ren Mai 6 point, and sham acupuncture in the placebo point are considered. Their study is derived from the statistical analysis of the results of the principal outcome. The existence of pain related to the treatment and the degree of satisfaction of the mother is also a secondary outcome, analyzed by the survey that the midwife carries out no more than 2 hours after the labor. At last, it is important to highlight that the degree of satisfaction of the midwife is also considered as a secondary outcome, since it is registered in the same survey.