Intervention group: Mothers in the intervention group were included in the breastfeeding training program with the group training method. The training program was developed by the researchers, and the content of the program was evaluated with the expert opinion of academicians, obstetricians, nurses and breastfeeding counselor midwives working on breastfeeding.

Control Group:Routine obstetric care and treatment procedures were applied to the mothers in the control group. In the hospital where the study was conducted, all mothers are routinely evaluated for breastfeeding by an infant nurse.

The importance of breastfeeding Benefits of breastfeeding for mother and baby Structure of the breast and milk production Breastfeeding techniques and positions Breastfeeding problems and breast care

This scale was developed by Cindy-Lee Dennis to measure breastfeeding competence and consists of 2 subscales and 33 items. The Turkish validity and reliability of the breastfeeding proficiency scale was made by Ekşioğlu and Çeber (2011). Breastfeeding self-efficacy increases as the total score increases in the 5-point Likert-type scale with a Cronbach Alpha coefficient of 0.91. The lowest score is 33, the highest score is 165.

It is a question form consisting of 25 questions in order to evaluate the knowledge about breastfeeding and breast milk before and after the training. The first application was done before the training and the second application was carried out in the 12th week.

The exclusive breastfeeding levels of their babies in the fourth and twelfth weeks of the mothers who received and did not receive education were evaluated.