Enhancing Social-Emotional Health and Wellbeing in the Early Years (E-SEE): A Study Protocol of a Community-based Randomised Controlled Trial with Process and Economic Evaluations of the Incredible Years Infant and Toddler Parenting Programmes, delivered in a Proportionate Universal Model

Introduction: Behavioural and mental disorders have become a public health crisis and by 2020 may surpass physical illness as a major cause of disability. Early prevention is key. Two Incredible Years parent programmes that aim to enhance child wellbeing and development, IY-Infant and IY-Toddler, will be delivered and evaluated in a proportionate universal intervention model called E-SEE Steps. The main research question is: Does E-SEE Steps enhance child social emotional wellbeing at 20 months when compared to services as usual?