This study aimed to develop a gamified digital intervention aiming to promote physical activity in early childhood. A further aim was to evaluate the feasibility of the intervention among the target group in child health clinics. The study consists of two phases. 

The development phase – a cross-sectional correlational study explored developmental factors associated with active play behaviour of 2.5-year-old toddlers (n = 717). Data were collected in child health clinics and consisted of the assessment of child’s neurological development and preference to participate in active play. Data were analyzed statistically. The results showed that delayed gross motor skills, self-help skills and auditory perception were negatively associated with a child’s preference to participate in physically active play. A quantitative systematic review explored previous gamified digital interventions that enhanced the physical activity self-efficacy of children. Data were collected from five electronic databases and analyzed narratively and statistically. The results showed that the gamified digital interventions are effective in enhancing the physical activity self-efficacy of children. The results from a correlational study and systematic review, together with National Physical Activity Recommendations, contributed to the development of the intervention. 

The feasibility and piloting phase – a mixed-method post-test feasibility study – evaluated the usability and acceptability of the intervention from the perspective of public health nurses (n = 5) and families with a child either 1.5 or 4 years old (n = 15). Data were collected using questionnaires and interviews, and analyzed statistically and with deductive qualitative content analyses. The results showed that the intervention was usable and acceptable. Suggestions for further development of the intervention consisted of simplifying the intervention, adding more gamified elements to be more attractive to children and adding more precise feedback for the parents. Based on these results, the intervention was modified and a cluster-randomized controlled study was planned to evaluate the effectiveness of the intervention.