Pregnant women fulfilling all the inclusion criteria and none of the exclusion criteria will be invited to participate in the experiment. These requirements includes primiparous women from 20 to 35 years old, with 37 to 42 weeks of gestation, and with a low obstetric risk labor with epidural analgesia. It is important to highlight that the midwife responsible for the labor is different from the acupuncturist responsible for the treatment.