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Introduction: Behavioural interventions in early life appear to show some effect in reducing childhood overweight and obesity. However, uncertainty remains regarding their overall effectiveness, and whether effectiveness differs among key subgroups. These evidence gaps have prompted an increase in very early childhood obesity prevention trials worldwide. Combining the individual participant data (IPD) from these trials will enhance statistical power to determine overall effectiveness and enable examination of individual and trial-level subgroups. We present a protocol for a systematic review with IPD meta-analysis to evaluate the effectiveness of obesity prevention interventions commencing antenatally or in the first year after birth, and to explore whether there are differential effects among key subgroups., Methods and Analysis: Systematic searches of Medline, Embase, Cochrane Central Register of Controlled Trials, Cumulative Index to Nursing and Allied Health Literature (CINAHL), PsycInfo and trial registries for all ongoing and completed randomised controlled trials evaluating behavioural interventions for the prevention of early childhood obesity have been completed up to March 2021 and will be updated annually to include additional trials. Eligible trialists will be asked to share their IPD; if unavailable, aggregate data will be used where possible. An IPD meta-analysis and a nested prospective meta-analysis will be performed using methodologies recommended by the Cochrane Collaboration. The primary outcome will be body mass index z-score at age 24±6 months using WHO Growth Standards, and effect differences will be explored among prespecified individual and trial-level subgroups. Secondary outcomes include other child weight-related measures, infant feeding, dietary intake, physical activity, sedentary behaviours, sleep, parenting measures and adverse events., Ethics and Dissemination: Approved by The University of Sydney Human Research Ethics Committee (2020/273) and Flinders University Social and Behavioural Research Ethics Committee (HREC CIA2133-1). Results will be relevant to clinicians, child health services, researchers, policy-makers and families, and will be disseminated via publications, presentations and media releases., Prospero Registration Number: CRD42020177408., Competing Interests: Competing interests: AB, ALS, BJJ, KEH, MA, RKG, SL and LPS reports grants from NHMRC Ideas Grant TOPCHILD (Transforming Obesity Prevention for CHILDren) (GNT1186363); APE and CGA reports grants administered by the Inter-American Development Bank from The Government of Japan and The PepsiCo Foundation; ALT reports grants from National Institute of Health; BJT reports grants from NZ Health Research Council; EO reports grants from the US National Institutes of Health, and the Canadian Institutes for Health Research; IMP reports grants from NIH/NIDDK; JSS reports grants from PCORI, NIH NIDDK and NHLBI, and personal fees from Danone Organic, American Academy of Pediatrics, and Lets Move Maine; LTK and JKL reports grants from Fonds NutsOhra; MCR reports grants from National Institute on Minority Health and Health Disparities-National Institutes of Health/Center for Collaborative Research in Health Disparities, and personal fees from Rhythm Pharmaceuticals; RSG reports grants from US Department of Agriculture and NIH/NICHD., (© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Introduction: Little is known about how early (eg, commencing antenatally or in the first 12 months after birth) obesity prevention interventions seek to change behaviour and which components are or are not effective. This study aims to (1) characterise early obesity prevention interventions in terms of target behaviours, delivery features and behaviour change techniques (BCTs), (2) explore similarities and differences in BCTs used to target behaviours and (3) explore effectiveness of intervention components in preventing childhood obesity., Methods and Analysis: Annual comprehensive systematic searches will be performed in Epub Ahead of Print/MEDLINE, Embase, Cochrane (CENTRAL), CINAHL, PsycINFO, as well as clinical trial registries. Eligible randomised controlled trials of behavioural interventions to prevent childhood obesity commencing antenatally or in the first year after birth will be invited to join the Transforming Obesity in CHILDren Collaboration. Standard ontologies will be used to code target behaviours, delivery features and BCTs in both published and unpublished intervention materials provided by trialists. Narrative syntheses will be performed to summarise intervention components and compare applied BCTs by types of target behaviours. Exploratory analyses will be undertaken to assess effectiveness of intervention components., Ethics and Dissemination: The study has been approved by The University of Sydney Human Research Ethics Committee (project no. 2020/273) and Flinders University Social and Behavioural Research Ethics Committee (project no. HREC CIA2133-1). The study's findings will be disseminated through peer-reviewed publications, conference presentations and targeted communication with key stakeholders., Prospero Registration Number: CRD42020177408., Competing Interests: Competing interests: AB, ALS, BJJ, KEH, MA, RG, SL and LPS reports grants from NHMRC Ideas Grant TOPCHILD (Transforming Obesity Prevention for CHILDren) (GNT1186363); APE and CGA reports grants administered by the Inter-American Development Bank from The Government of Japan and The PepsiCo Foundation; AT reports grants from National Institute of Health; BJT reports grants from NZ Health Research Council; EO reports grants from the US National Institutes of Health, and the Canadian Institutes for Health Research; IMP reports grants from NIH/NIDDK; JS reports grants from PCORI, NIH NIDDK and NHLBI, and personal fees from Danone Organic, American Academy of Pediatrics and Lets Move Maine; LTK and JL reports grants from Fonds NutsOhra; MR reports grants from National Institute on Minority Health and Health Disparities-National Institutes of Health/Center for Collaborative Research in Health Disparities, and personal fees from Rhythm Pharmaceuticals; RSG reports grants from US Department of Agriculture and NIH/NICHD., (© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

Introduction: In Latin America, a rapid increase in obesity alongside persistent malnutrition has resulted in a double burden of disease that affects the most vulnerable segments of the population. Infant and young child feeding practices are important factors that affect both sides of the growth curve. Interventions such as behavioural change strategies and home fortification using products like small-quantity lipid-based nutrient supplements (SQ-LNS) have the potential to reduce the presence of both these conditions, especially if they are implemented during the first 1000 days of life. This paper details the protocol for Sustained Programme for Improving Nutrition (SPOON), an innovative strategy to prevent stunting and reduce risk for obesity in children under 24 months old in high-poverty areas in Baja Verapaz, Guatemala., Methods and Analysis: SPOON Guatemala is a three-arm randomised control trial: treatment group 1 will receive the SPOON behavioural change strategy and SQ-LNS, treatment group 2 will receive the SPOON behavioural change strategy and micronutrient powders; the control group will receive the standard of care provided by the Ministry of Health, which includes micronutrient powders. A modified formula of SQ-LNS has been especially developed for this trial. A total of 76 communities are included in the study and 1628 households with a pregnant woman in the third trimester or a child under 4.5 months were recruited at baseline. Baseline data were collected between September and November 2018. Follow-up data will be collected 2 years after the start of the intervention. The primary outcomes of interest are related to mothers' infant feeding knowledge and practice, and indicators of children's nutritional status and growth including height, weight, weight gain rate and prevalence of stunting, overweight, obesity and anaemia. After follow-up data have been collected, differences of simple means and regression models including covariates such as child's age and sex, characteristics of the primary caregiver and household socioeconomic indicators will be estimated. Heterogeneous effects will also be estimated within subgroups of age at exposure, sex, caregiver characteristics and household socioeconomic status., Ethics and Dissemination: This study was approved by the National Health Ethics Committee of the Ministry of Health of Guatemala (resolution 10-2018). Informed consent was obtained from all mothers and caregivers prior to enrolment in the programme. Results will be submitted to a peer-reviewed medical or public health journal, and disseminated internally at the Inter-American Development Bank, with the Government and Stakeholders in Guatemala and through international conferences and seminars., Trial Registration Number: NCT03399617., Competing Interests: Competing interests: All authors were employed by the Inter-American Development Bank at the time of the study’s conception and implementation. AP-E reports grants from PepsiCo Foundation, grants from The Government of Japan, provided to the Inter-American Development Bank to implement and evaluate the SPOON ProgramProgramme. AP-E was a staff and subsequently a paid consultant for SPOON at the Inter-American Development Bank. All opinions in this paper are those of the authors and do not necessarily represent the views of the Government of Guatemala or the Inter-American Development Bank, its Executive Directors or the governments they represent., (© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)