Background: Despite modest mean body mass index (BMI) improvements in pediatric weight management interventions (PWMIs), some children are more and less successful in achieving a healthier weight. We sought to understand key behavior modifications and strategies used to overcome barriers that led to success or nonresponse. Methods: Using a semistructured guide, we conducted interviews in English and Spanish to explore the perspectives of caregivers whose children responded (BMI z-score change of greater than or equal to -0.2 units over 1 year) or did not respond (≥5% increase in % of the 95th percentile for BMI over 1 year) to a PWMI. Interviews were recorded, transcribed, and then coded using the framework approach. Researchers met regularly to review coding, content, and emerging themes. Results: We reached thematic saturation after interviewing the caregivers of 14 responders and 16 nonresponders and identified 7 themes as key elements of a positive response: (1) positive parenting approach; (2) application and practice of new information; (3) higher agency for change; (4) management of unmet social needs through creative solutions; (5) promoting mindful eating; (6) family alignment on health behaviors; and (7) mitigation of weight stigma. Conclusion: The effectiveness of PWMI may be enhanced by incorporating curricular elements that specifically promote the approaches identified among responders in this study. Similarly, lessons can be learned from nonresponders, so clinicians can identify and help early on when behaviors associated with nonresponse are seen. Clinical Trial Registration number: ClinicalTrials.gov: NCT03012126.
Keywords: childhood obesity; nonresponders; primary care; responders.