[en] Background:(1) Statistically significant association between sociodemographic and gynecological-obstetric variables. Background:(2) The puerperal women had inadequate knowledge, attitudes and practices about the mini-pill. Background:(3) After two months, there was an increase in the puerperal women's knowledge and practice. Background:(4) The average Knowledge, Attitude and Practice scores before the intervention and after 60 days remained inadequate. Background:(5) The technology used in the educational intervention is effective in promoting the Knowledge, Attitude and Practice domains. to evaluate the effectiveness of an educational intervention on the knowledge, attitude and practice of adolescent puerperal women regarding the mini-pill as a method of contraception in the postpartum period. a quasi-experimental study with pre- and post-tests carried out with 139 puerperal adolescents in four public maternity hospitals, using an instrument with sociodemographic/gyneco-obstetric questions and a targeted survey called Knowledge, Attitude and Practice. The following were used in the analysis: Statistical Package for the Social Sciences software, version 20.1 for Windows; 5% significance level; 95% confidence interval; Shapiro-Wilk test to test data normality and paired t-test. the average scores for the Knowledge, Attitude and Practice instrument were inadequate before the educational intervention; after the intervention, they remained inadequate, but with a slight improvement; the attitude was markedly inadequate. This instrument, before the intervention, was associated with age, education, number of pregnancies and having had prenatal care; after the intervention, in addition to these, it was associated with other variables, such as place of residence, being in school and having used contraception. The three domains were associated before and after the intervention. the educational intervention, mediated by the nurse, was effective in promoting the knowledge, attitude and practice of puerperal adolescents in the proper use of the mini-pill as postpartum contraception.

[es] avaliar la efectividad de una intervención educativa en el conocimiento, la actitud y la práctica de puérperas adolescentes sobre minipíldora como método de contracepción en el posparto. estudio cuasi experimental con pre y post-tests realizado con 139 puérperas adolescentes en cuatro maternidades públicas, utilizando un instrumento con preguntas sociodemográficas/gineco-obstétrica y una encuesta dirigida llamada Conocimiento, Actitud y Práctica. En el análisis, se utilizaron:software Statistical Package for the Social Sciences, versión 20.1 paraWindows; nivel de significancia del 5%; intervalo de confianza del 95%; prueba Shapiro-Wilk para probar la normalidad de los datos y testtpareado. los puntajes medios del instrumento Conocimiento, Actitud y Práctica resultaron inadecuados antes de la intervención educativa; después de la intervención, permanecieron inadecuados, pero con discreta mejora; la actitud mostró una inadecuación acentuada. Dicho instrumento, antes de la intervención, se asoció con edad, escolaridad, número de embarazos y haber realizado prenatal; después de la intervención, además de estas, tuvo asociación con otras variables, como lugar de residencia, estar estudiando y haber usado método contraceptivo. Los tres dominios tuvieron asociación entre sí antes y después de la intervención. la intervención educativa, mediada por la enfermera, fue efectiva para promover conocimiento, actitud y práctica de las puérperas adolescentes en el uso adecuado de la minipíldora como contracepción posparto.