 The THPP study aims to evaluate the effects of an extended 36-month perinatal depression intervention on mother and child outcomes using a cluster randomized controlled trial c-RCT design. The trial will recruit 560 pregnant women who screened positive for perinatal depression PHQ-9 10 from 40 village clusters, of which 20 clusters will receive the THPP intervention delivered by trained peers. These women will have already been participating in the trial of the shorter, 6 month long, version of the intervention. Women in the THPP intervention arm will receive bimonthly group-based sessions. Primary outcomes are 3-year maternal depression and 3-year child socio-emotional and cognitive development. All primary analyses will be intention-to-treat and will account for the clustered study design. 