| What it is | A private Facebook group offering evidence‑based education and peer support focused on infant safe sleep practices | A private Facebook group offering evidence‑based education and peer support focused on breastfeeding practices | A private Facebook group combining education and peer support on both safe sleep and breastfeeding | A private Facebook group providing education on early brain development and parent‑child relationships (active comparator content) |
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| Role in trial | One of four study arms delivering behavioral education on safe sleep | One of four arms delivering behavioral education on breastfeeding | One of four arms combining safe sleep and breastfeeding education | Control arm providing alternate behavioral education on early brain development and parent‑child bonding |
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| Primary use | To promote safe infant sleep practices by changing social norms through online education and peer support | To promote breastfeeding practices by changing social norms via online education and peer support | To promote both safe sleep and breastfeeding practices through combined online education and peer support | To provide general parenting education on early brain development and parent‑infant relationships |
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| How it is delivered | Moderated private Facebook group with videos, multimedia, and peer interaction from ~32 weeks gestation to 6 months postpartum | Moderated private Facebook group with videos, multimedia, and peer interaction from ~32 weeks gestation to 6 months postpartum | Moderated private Facebook group combining content on safe sleep and breastfeeding from ~32 weeks gestation to 6 months postpartum | Moderated private Facebook group with early brain development and parent‑child relationship content from ~32 weeks gestation to 6 months postpartum |
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| Evidence status | Evidence on social media groups suggests they may support behavior change by shifting norms, though trial results are pending | Evidence on social media groups suggests they may support behavior change by shifting norms, though trial results are pending | Combined education via social media may influence both safe sleep and breastfeeding norms, though empirical outcomes are not yet available | The active comparator arm offers different parenting content; no evidence on comparative impact for safe sleep or breastfeeding yet |
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| Important limitations | Behavioral intervention delivered online may not reach parents without internet access, and self‑reported practices may be subject to bias | Online delivery may exclude those without reliable access and relies on self‑reported behaviors subject to bias | Same online delivery limitations apply to combined content and may dilute focus compared with single‑topic groups | May not influence safe sleep or breastfeeding behaviors since content focuses on other parenting topics |
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