Large Scale Implementation of MINISTOP 3.0

MINISTOP is an evidence-based app for parents of preschool aged children with the overall aim to promote healthy lifestyle behaviors and prevent the development of overweight and obesity. MINISTOP has been previously been evaluated in two previous trials (MINISTOP 1.0 and 2.0) with promising results. Therefore, the overall aim of this trial is to evaluate the large scale implementation of MINISTOP within Swedish primary child healthcare. The specific aims are to: (i) To compare two different implementation strategies for MINISTOP 3.0 (i.e., Basic vs. Enhanced) on: a) acceptability, appropriateness, feasibility as well as organizational readiness to implement MINISTOP 3.0 within primary child healthcare (primary outcomes) and b) reach, costs, adoption, and sustainability of MINISTOP 3.0 within primary child healthcare (secondary outcomes). (ii) To compare two different implementation strategies of MINISTOP 3.0 within primary child healthcare on children's key dietary indicators, physical activity, and screen time (secondary outcomes). (iii) To compare the cost-effectiveness of two different implementation strategies for MINISTOP 3.0.

Inclusion Criteria: * Child healthcare nurse at participating child healthcare centers No exclusion criteria.