Background: Globally, 13% of children experience a mental disorder. Mental health problems in infancy are closely related to attachment, which serves as the primary bond within the family and forms the basis for personality development and mental health. In Mexico, research on infant mental health is limited. Objective: To determine the relationship between attachment styles and family mental health in indigenous populations from the southern Huasteca region of San Luis Potosí, Mexico. Method: A cross-sectional, descriptive, analytical, and correlational study. The study utilized the Reporting Questionnaire for Children (RQC), Self-Report Questionnaire (SRQ), Attachment Styles Classification Questionnaire (ASCQ), and Mental Health in Primary Care (MHQPHC). Results: The sample included 179 families with children aged 6 to 12. Sampling was cond...