[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.

[pt] avaliar a efetividade de uma intervenção educativa no conhecimento, na atitude e na prática de puérperas adolescentes sobre minipílula como método de contracepção no pós-parto. estudo quase experimental com pré e pós-testes realizado com 139 puérperas adolescentes em quatro maternidades públicas, utilizando-se um instrumento com questões sociodemográficas/gineco-obstétrica e um inquérito direcionado chamado Conhecimento, Atitude e Prática. Na análise, foram usados:softwareStatistical Package for the Social Sciences, versão 20.1 paraWindows; nível de significância de 5%; intervalo de confiança de 95%; teste Shapiro-Wilk para testar normalidade dos dados e testetpareado. os escores médios do instrumento Conhecimento, Atitude e Prática mostraram-se inadequados antes da intervenção educativa; após a intervenção, permaneceram inadequados, mas com discreta melhora; a atitude mostrou-se com inadequação acentuada. Tal instrumento, antes da intervenção, associou-se com idade, escolaridade, número de gravidezes e ter feito pré-natal; após a intervenção, além destas, teve associação com outras variáveis, como local de residência, estar estudando e ter usado método contraceptivo. Os três domínios tiveram associação entre si antes e após intervenção. a intervenção educativa, mediada pela enfermeira, foi efetiva para promoção de conhecimento, atitude e prática das puérperas adolescentes no uso adequado da minipílula como contracepção pós-parto.