Recent advances in MRI are transforming early brain development research. The emergence of ultra-high-field (UHF) and ultra-low-field (ULF) MRI provides unique and complementary opportunities to study neurodevelopment in greater detail and in broader contexts. ULF MRI is enabling imaging in low- and middle-income countries (LMICs), where the burden of early-life risk factors (e.g. malnutrition, infection), is disproportionately high while remaining significantly underrepresented in MRI research. ULF systems offer a rare opportunity to address this inequity through inclusive research, guided by global health priorities. UHF MRI offers unparalleled sensitivity to subtle anatomical, functional and metabolic features in the developing brain. Its enhanced contrast and resolution support advanced biophysical modelling and spectroscopy, helping to elucidate developmental trajectories and pathologies associated with preterm birth, congenital conditions and later outcomes. Integrating novel insights from ULF and UHF imaging and bridging technological innovation with clinical and global health perspectives, this symposium showcases how unconventional field strengths are reshaping early developmental neuroscience. This aligns with the meeting's focus on technological innovation, advancing clinical practice, and addressing new frontiers in MRI research. The session includes 5 speakers from different backgrounds, institutions and career stages, followed by an audience led Q&A session and discussion.