Once that the pregnant women who met the criteria has been identified, investigators will ask for another informed consent or written assent for explaining in detail the whole study, and invite them to participate. Also, sociodemographic data and a self-efficacy questionnaire (a questionnaire about the feeling of the participant to be capable of breastfed her baby) will be collected. The aim is to recruit 200 women. Then, investigators will assign randomly each one of the women to a study group (intervention group or control group).