Video-Based Peer Support and Exclusive Breastfeeding and Maternal Self-Efficacy: A Randomized Clinical Trial.

Importance: Peer support is a promising strategy to improve breastfeeding outcomes, but evidence for online formats is limited. Objective: To evaluate whether structured peer support delivered via video calls improves exclusive breastfeeding rates and maternal breastfeeding self-efficacy. Design, Setting, and Participants: This multicenter, randomized clinical trial enrolled first-time mothers with low breastfeeding confidence from 4 public postnatal wards in Hong Kong from January 31, 2021, to June 30, 2024. Participants were randomly assigned (1:1) to intervention or control. The primary analysis was conducted from July 1 to 31, 2024, with final data analysis completed by December 31, 2025. Intervention: The intervention included usual postnatal care, consisting of access to lactation consultants and standard breastfeeding information from the Department of Health, plus at least 2 video call sessions with trained peer support volunteers at 10 days and 1 month post partum. Main Outcomes and Measures: The primary outcome was the proportion of infants who were exclusively breastfed at 6 months post partum. Secondary outcomes included exclusive breastfeeding at 1, 2, and 4 months post partum and maternal self-efficacy (measured using the Breastfeeding Self-Efficacy Scale-Short Form) at 2 and 4 months. All outcomes were analyzed on an intention-to-treat basis. Results: Among 442 participants, 224 were allocated to the intervention group and 218 were allocated to the control group. The mean (SD) maternal age was 32.4 (4.0) years (32.4 [4.2] years in the intervention group and 32.3 [3.9] years in the control group). The primary 6-month outcome did not differ significantly between groups (37 of 184 [20.1%] vs 29 of 186 [15.6%]; adjusted odds ratio [AOR], 1.57 [95% CI, 0.85-2.89]; P = .15); however, exclusive breastfeeding at 2 months (a secondary outcome) was significantly higher in the intervention group (54 of 199 [27.1%] vs 38 of 200 [19.0%]; AOR, 1.80 [95% CI, 1.08-3.01]; P = .02). Longitudinal analysis confirmed higher odds of exclusive breastfeeding in the intervention group over time, with the largest difference at 2 months. Breastfeeding self-efficacy showed significantly greater improvement in the intervention group (time × intervention interaction: β = 1.01 [95% CI, 0.21-1.81]; P = .01), with a higher score at 4 months (adjusted β, 4.65 [95% CI, 1.60-7.70]; P = .01). Conclusions and Relevance: In this randomized clinical trial, video call-based peer support did not increase exclusive breastfeeding at 6 months; however, it significantly increased exclusive breastfeeding at 2 months and improved maternal breastfeeding self-efficacy, offering a scalable model for postnatal care integration. Trial Registration: ClinicalTrials.gov Identifier: NCT04621266.