Changes in UK pre-schooler's mental health symptoms over the first year of the COVID-19 pandemic: Data from Co-SPYCE study.

Our findings reinforce the importance of examining pre-schoolers' mental health in the context of micro and macro-level factors. Interventions focussing on family factors such as parent mental health, as well as continued provision of childcare, may have most potential to mitigate the impact of COVID-19 on young children's mental health.