Objective: To assess the prevalence of the urinary tract infection (UTI), urinary incontinence (UI), anal incontinence (AI) and dyspareunia among primiparous women, as well as to identify the association between dyspareunia and UI and mode of birth. Material and methods: Prospective observational study carried out with 96 post-partum women (72 normal births and 24 caesarean section), two and six months after birth. Data were collected via prenatal cards, medical registers and interviews with women between January and August, 2014, at the Centro do Parto Normal do Pronto Socorro e Maternidade Municipal Zoraide Eva das Dores, located in Itapecerica da Serra, São Paulo, and at Health Centers in the Itapecerica da Serra and the cities of Juquitiba, São Lourenço and Embú-Guaçú. Results: During pregnancy, 52.1% of women reported UTI and 30.2%, UI. Two and six months after birth, there was a prevalence of 4.2% and 11.8% of UTI, 17.7% and 11.8% of UI, 8.4% of AI (6.3% of flatus incontinence and 2.1% of feces) and 2.0% (only flatus incontinence; there was no faecal incontinence); and 48.1% and 17.8% of dyspareunia, respectively. There was no statistical association between the mode of delivery and dyspareunia and UI (p=0.742 and p=0.738; respectively). Conclusions: The most frequent pelvic floor dysfunctions (PFD) after birth were IU and dyspareunia. There was spontaneous reduction of the PFD in the sixth month after birth. The early identification of these diseases is extremely important to prevent, diagnose and treat any harm to women's physical and emotional health. [ABSTRACT FROM AUTHOR]