Introduction: Breast milk is the best food to meet the nutritional needs of the child, exclusively for the first 6 months and up to two years of age, favoring the establishment of the mother-child bond. Objective: To carry out a cognitive intervention to the women who attend the “breastfeeding support group”. Method: Quantitative research, with a quasi-experimental design, in a census sample made up of 11 pregnant women and 19 breastfeeding women. The Iowa Infant Feeding Attitudes Scale (IIFAS) was used. Results: 33.30% (10) are between 33-35 years old, 63% (19) in the puerperium, 56% (17) with primary education, 60% (18) carry out agricultural / cattle raising activities, 53% (16) in free union. In the pre-intervention, the women had a positive attitude with a score of 17-48 towards artificial breastfeeding 83% (25), in the post-intervention the positive attitude towards breastfeeding changed 87% (26), with a significant difference of p <0.01, in the items of the IIFAS instrument in the pre-intervention a mean and standard deviation of 2.07 ± 1.16, with an increase in the post-intervention of 4.48±0.65, a significance difference <0.05 in the total of questions in the pre-intervention from 35.23, increased after the intervention to 76.13, their attitude changed to exclusive breastfeeding. Conclusions: the cognitive intervention increased the positive attitude towards exclusive breastfeeding, highlighting that a timely educational intervention of promotion, support and accompaniment during pregnancy and postpartum guarantees the duration and exclusivity of breastfeeding.
 
 Keywords: breastfeeding, breastfeeding behavior, breastfeeding, knowledge, attitudes and health practice