Inequities in learning, development and health are evident when children start school. These track into adulthood with consequent poorer educational, health and social outcomes. Māori and Pacific and children from disadvantaged communities are disproportionately affected. These outcomes are unjust and costly for society. This grant supports collaboration for child wellbeing. It builds on existing relationships in Tāmaki and expands the health and education collaboration developed through the Welcome to School Projects. With the Manaiakalani Kahui ako, we will adapt and test a play-based intervention to improve self-regulation so it is culturally-grounded, engaging, and developmentally scaffolded. Experienced Māori and Pacific researchers have joined the team exploring parental views of development and screening tools to ensure the Well Child Programme is informed by NZ scientific evidence, incorporates Te Ao Māori and Pacific views on development, and does not inadvertently increase inequity.