Randomisation
The unit of randomisation was the nursery (cluster) at a two 2:1 (intervention:control) ratio. A 2:1 randomisation was implemented to maximise the number of nurseries who experienced the intervention, while also maintaining an RCT design, to help inform a definitive trial. Randomisation occurred while nurseries were collecting consent from parents/caregivers and was conducted by an independent researcher. Nurseries were informed of their group allocation approximately two weeks prior to baseline.