Introduction: To develop a self administrated Children Health-related behaviours assessment suitable, and to test its feasibility and reliability in French children. Methods: A sample of 216 children participated in the first stage of this study. An independent sample of 99 children participated in the assessment of reliability. Test and retest of the questionnaire were carried out to investigate test–retest reliability. Results: Missing or inappropriate responses on different parts of the questionnaire ranged from 0% to 35%. Some questions about drink intake have been modified or removed due to the high percentages of reported problems on these items. No problems were reported on the dimensions of physical activity habits and sedentary behaviors. The mean percentage of agreement in test–retest reliability for the questionnaire dimensions was 78% (47%–99%). Overall, kappa coefficients were good. Discussion: This instrument as an acceptable and reliable instrument for assessing lifestyle habits in French children.