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IntroductionPostpartum depression is a mild mental and behavioural disorder associated with the puerperium commencing within 6 weeks of delivery (World Health Organization, 2010). It is a global public health concern because of its adverse effects on the mother, infant and close others (Almond, 2009;Fisher, Cabral de Mello, Izutsu, & Tran, 2011). Historically, it was hypothesised that postpartum depression was largely absent in 'nonwestern' contexts due to greater social support during the postpartum period (Stern & Kruckman, 1983). Postpartum depression prevalence of around 13% is estimated for North American and western European contexts (Affonso, De, Horowitz, & Mayberry, 2000;O'Hara & Swain, 1996), but recent estimates suggest a much higher prevalence in South Asia, up to 36% in Pakistan (Gausia, Fisher, Ali, & Oosthuizen, 2009;Husain et al., 2006;Savarimuthu et al., 2010) Evidence for the aetiological contribution of psyco-social factors to postpartum depression is greater than that for biological factors, with chronic social adversity in women playing a substantial role (Fisher, et al., 2011;Robertson, Celasun, & Stewart, 2003). Systematic reviews consistently highlight an association between postpartum depression and aspects of social relationships, such as low social support or low quality marital relationship (Beck, 2001;O'Hara & Swain, 1996;Robertson, et al., 2003). This is supported by a large body of literature linking social relationships with a range of physical and mental health outcomes more generally (Cohen, Gottlieb, & Underwood, 2000). Social relationships may affect cognitions, emotions, behaviours and biological responses in a manner which has implications for health, either directly ('main effects' hypothesis) or indirectly by influencing affective reactions to situations ('stress buffering' hypothesis) .'Social relationships' are a complex and multi-dimensional concept. The literature focuses on 'social support', defined as the exchange of social resources between persons (Cohen & Syme, 1985). Support has structural dimensions, such as the size and range of the support network, as well as functional dimensions, such as the type, source and quality of support (House & Khan, 1985). Su...