Objective: To find out the effectiveness of pelvic-perineal physiotherapy in prevention and treatment of postpartum pelvic floor dysfunction caused by vaginal delivery. Design: Randomized, controlled and single blinded clinical trial. Participants will be randomly assigned to one of these groups: Experimental group: pelvic-perineal physical therapy plus hypopressive exercises plus training in lifestyle advice; Experimental group II: hypopressive exercises plus training in lifestyle advice; Control group: just training in lifestyle advice. In the 3 groups several physical therapy assessments will be undertaken: 1st before intervention, 2nd immediately after completing intervention; 3th, 4th, 5th and 6th after 3, 6, 12 and 24 months. Study subjects: Postnatal women (6 and 8 weeks after vaginal delivery), primiparous, whose vaginal delivery has occurred in the "PrÍncipe de Asturias" Hospital, which have not been already treated for pelvic floor dysfunction, and after reading, understanding and freely signing an informed consent form. Sample size: 240 subjects will be included (80 subjects per group). Allowing for 15% of drop-outs and taking into account that 17% of women in the intervention group may develop pelvic floor dysfunction (urinary incontinence) versus 40% in the control group, with an alpha risk of 0.05, a beta risk of 0.1 in a bilateral contrast using the arcsine approximation. Data analysis: A descriptive analysis will be done of all variables. A confidence level of 95% (p <0,05) will be established for all the cases. Effectiveness will be evaluated by comparing between the two groups of the change in outcome variables between visits.