Three Australian Government commissioned reports from 2011-2017 convey a longstanding child development theory-practice gap in early childhood education. This study explores what informs mentors' discussions of theories of child development with early career preschool teachers. Grounded in Interpretative Phenomenological Analysis, themes relate to the wide role of the early childhood teacher, variation in initial teacher education, developing teacher identity, emotional connections, and consolidation and extension of university learning of child development theories. Critical discussion of themes from a Freirean perspective illustrates how mentors conveyed experiences of oppression, marginalisation, and liberation. We offer that though the child development theory-practice gap is historically presented as problematic, those interviewed suggest it is a natural and necessary part of the journey for beginning teachers. Although implications for Australian initial teacher education policy and practice are presented, this study serves as a case example for future comparative international research in this field.