Objective: to determine the effect and influence of an educational intervention on childcare consultation on nurses’ knowledge and practice. Method: a mixed research method was adopted, with a sequential explanatory design, characterized by a stage with a quantitative approach, developed in a quasi-experimental study, with 30 nurses, followed by a qualitative one, carried out by in-depth interview, with 11 nurses working in the Family Health Units of João Pessoa, Paraíba, Brazil. In quantitative analysis, descriptive statistics and proportion test were used, and in qualitative analysis, thematic analysis was used. Results: the effect of the educational intervention was statistically significant in the consultation dimensions: consultation frequency; child nutrition; physical examination; growth assessment; development assessment; and health education. In the qualitative stage, the influence of the intervention in expanding knowledge and changing some nurses’ practices in the aforementioned dimensions was understood, with agreement between the data found. Conclusion: the positive effect of the educational intervention on nurses’ knowledge and practice in childcare consultations was evident, enabling them to reflect on the content covered and promote changes in their daily lives.