An envelope with 120 leaflets will be enabled, 60 with control group name and 60 with intervention group name. After the approval of the pregnant woman, the acupuncturist will ask a partner midwife, a doctor or a nursing assistant to randomly pick up one of the leaflets from the aforementioned envelope, so pregnant woman will be assigned to a group. It is important to highlight that both the midwife and the pregnant woman must not know about the assigned group.