BiBBS ACHIEVE (Addressing Childhood Inequalities through EVidence-Based Early interventions) builds upon the Born in Bradford’s Better Start (BiBBS) birth cohort, which has followed over 5500 ethnically diverse children since 2016. This new phase (2025-2033), funded by Wellcome, will enhance our understanding of children’s health, wellbeing, and educational development in middle childhood. The programme aims to capture how recent systemic shocks have shaped children’s lives, and how existing early interventions can be adapted to reduce inequalities. By focusing on children aged 7-8 years, BiBBS ACHIEVE will bridge gaps in our understanding of children’s development, often referred to as the “missing middle”, so that children can be better supported to reach their potential.