Inclusion and exclusion criteria.

Background
Mental health issues and parenting difficulties in the perinatal period are common, and have significant negative impacts on individuals, families, and broader society. Community-based peer support programs might be an effective adjunct to standard mental health interventions in perinatal mental health issues, specifically where low-cost interventions are required, or access to professional care is limited.
Methods
A systematic review will be undertaken. Searches will be conducted on four electronic databases (Pubmed, Embase, Cinahl, and PsycINFO), using terms related to perinatal mental health and peer support. Literature will be screened by title and abstract and then by full text. Selected studies will be evaluated using the Quality Assessment with Diverse Studies (QuADS) tool. Data relevant to community-based perinatal peer support intervention characteristics and outcomes will be extracted, and synthesised narratively.
Discussion
This review will contribute to the existing evidence about perinatal mental health peer support, by synthesising information about community-based interventions specifically. The findings will be used to inform the design, implementation, and evaluation of a community-based perinatal mental health peer support program in urban and rural/remote hospital and health services in Australia.
Trial registration
Systematic review registration: CRD42023451568.