["Infant Mental Health Journal: Infancy and Early Childhood, Volume 47, Issue 4, July 2026. ", "\nAbstract\nInfant and Early Childhood Mental Health Consultation (IECMHC) is a preventative intervention that is theorized to mediate its impacts through the consultative stance, described as a consultant's “way of being” in relationship. However, limited tools are available to measure the elements of the consultative stance or the degree to which consultants and supervisors assess its implementation. This study describes the conceptualization, development, and piloting of a set of tools in the United States measuring the consultative stance for use by consultants and supervisors, the Consultative Stance Learning and Measurement tools (CSLM). The CSLM includes the Consultant Self Reflection (CSR) and the Supervisor Survey (SS). Seventy‐six consultants and 28 supervisors completed the tools at least once, with 48 consultants completing the tool at three timepoints. A confirmatory factor analysis (CFA) tested the theorized latent structure of the tool, providing good support for the CSR and moderate support for the SS. Over time, consultants and supervisors increasingly aligned in their perceptions of consultant implementation of the consultative stance, though consultants rated their implementation lower than supervisors. The tools advance the field's capacity to measure the impact of IECMHC and provide targeted information for ongoing reflective supervision and training, as consultants develop their practice.\n"]