OBJECTIVES:

To describe and analyze the level of knowledge and quality information of pregnant women about breastfeeding, before and after an informative intervention on breastfeeding myths. Secondary objectives: To determine the possible relationship of the variables "personal and sociodemographic", "social environment" and "previous parity" with the level of breastfeeding knowledge pre- and- post-intervention and to identify from where they received breastfeeding information during pregnancy.

MATERIALS AND METHODS:

Experimental, longitudinal, prospective, analytical, before-after study. Application of a questionnaire of myths related to breastfeeding to patients between 18 and 22 weeks of pregnancy. After answering the questionnaire, an information sheet on the realities of breastfeeding was handed out. At 37 to 38 weeks, the questionnaire was administered again, and responses were measured.

RESULTS:

189 pregnant women participated. After the intervention, the number of correct answers increased (3.7 ± 3.9; 95%CI: 3.2 ~ 4.3; p < 0.001) and the number of errors (-1.2 ± 2.2; 95%CI: -1.5 ~ -0.9; p < 0.001) and the number of those who did not know or did not answer (-2.5 ± 3.5; 95%CI: -3.0 ~ -2.0; p < 0.001) decreased. There was no relationship in the differences in hits between both pre- and post-intervention phases with respect to educational level (p = 0.5) but the differences in hits were lower in multiparous women (Rho = -0.557; p < 0.001; R2 = 0.26). In a multivariate analysis, the variables related to the difference in hits were age of the oldest child and having previous information (R2 = 0.167; F = 4.257; p = 0.045).

CONCLUSIONS:

After the informational intervention there was an improvement in the knowledge response about breastfeeding.

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