Health4Life a Digital Intervention to Promote Healthy Lifestyle Behaviours From the Start of Life

Health4Life: A Digital Intervention to Promote Healthy Lifestyle Behaviours From the Start of Life: Protocol for a Hybrid Effectiveness-implementation Study

The overall aim of this project is to evaluate the effectiveness and implementation of a digital intervention to support parents to create healthy lifestyle behaviours from the start of their infant's life, in order to prevent overweight and obesity. Using a randomized controlled trial with a hybrid type I implementation-effectiveness design we will:

1. evaluate the effectiveness of the 16-month Health4Life intervention on:

   1. Children's' dietary intake, screen time, physical activity, and sleep
   2. Children's body mass index (BMI) z-scores
   3. Parental self-efficacy

2. Evaluate the cost-effectiveness of the Health4Life app.

3. Evaluate and explore the implementation of the Health4Life app within primary child healthcare with regards to its:

   1. acceptability, appropriateness, and feasibility according to child healthcare nurses.
   2. satisfaction and usage by parents.

Inclusion Criteria:

• 0-2 month old infants at routine visits at selected child healthcare centers in Sweden.

Exclusion Criteria:

• Infants diagnosed with a neurological or endocrine disorder.
• Infants who have a parent suffering from a serious physical or psychological disease making the study too demanding for the family.
• Infants from families who will not be able understand the content of the app.