While Australia has high breastfeeding initiation, there is a sharp decline in the first weeks postpartum and this continues throughout the first year. Supporting breastfeeding In Local Communities (SILC) was a three-arm cluster randomised controlled trial to determine whether early home-based breastfeeding support by a maternal and child health nurse (SILC-MCHN), with or without access to a community-based breastfeeding drop-in centre, increased the proportion of infants receiving any breast milk at three, four and six months. The trial was conducted in ten Local Government Areas (LGAs) in Victoria, Australia.The primary aim of this paper is to describe the three drop-in centres established during the trial; and the profile of women who accessed them. The secondary aim is to explore the views and experiences of the drop-in centre staff, and the challenges faced in establishing and maintaining a breastfeeding drop-in centre in the community.Evaluation of the three LGAs with drop-in centres was multifaceted and included observational visits and field notes; data collected from attendance log books from each drop-in centre; a written survey and focus groups with maternal and child health (MCH) nurses who ran the drop-in centres; and semi-structured interviews with MCH coordinators of the participating LGAs.The three LGAs developed and ran different models of breastfeeding drop-in centres. They reported challenges in finding convenient, accessible locations. Overall, attendance was lower than expected, with an average of only one attendee per session. Two global themes were identified regarding staff views: implementation challenges, encompassing finding accessible, available space, recruiting volunteers to provide peer support, and frustration when women did not attend; and the work of SILC-MCHNs, including themes of satisfying and rewarding work, juggling roles, and benefits to women, babies and the community.Providing community-based breastfeeding support was satisfying for the drop-in centre staff but proved difficult to implement, reflected by the lower than anticipated attendances at all of the drop-in centres. Interventions to increase breastfeeding in complex community settings require sufficient time to build partnerships with the existing services and the target population; to understand when and how to offer interventions for optimum benefit.Australian New Zealand Clinical Trials Registry ACTRN12611000898954.