In this cohort of Māori and Pacific infants exposed antenatally to maternal obesity, carriage of the CREBRF minor rs373863828 A allele did not alter body size and composition at birth and early infancy but was associated with lower FM at 12 to 18 months’ corrected age, although this association may have been mediated by reduced exposure to GDM. The gene discussed is CREBRF; the disease is gestational diabetes.