Objective Our primary objective was to determine the social and demographic determinants of interpregnancy weight change. A secondary aim is to highlight the novel linkage of two data resources in Northern Ireland (NI) and the potential for transformative research in maternal health. Approach We piloted a process to link two datasets in a safe. legal and ethical manner. https://www.mariameetsanna.com/product-category/color-extend-magnetics-megamask/