Children from vulnerable backgrounds often have insecure attachment or disorganized attachment, which are related to psychological troubles, and such children need interventions to help them heal. The attachment system reorganizes in middle childhood, and other important adults play a considerable role in children’s lives. Thus, it is essential to weigh the impact of psychosocial interventions, while the main focus of the intervention is the staff member’s direct work with the child through a trusting relationship. The primary purpose of this study is to investigate whether children’s attachment security and mental health outcomes change after participating in a trauma-informed, attachment-based, Trust-Based Relational Intervention (TBRI) provided in a daycare center. It was a case-series study involving twelve children aged 8–11 years. The child attachment interview (CAI), CBCL/6-18, TRF/6-18, and clinical interviews for parents and children were used, measuring the change between the TBRI implementation in the daycare center and after one year. For ten participants, we noticed an improvement in mental health; for seven participants, security scales improved; for two participants, their disorganized attachment changed into insecure–dismissing. We have preliminary evidence that vulnerable children may benefit in terms of attachment security and mental health from the trusting relationship that staff build using the TBRI.

Children growing up in institutions lack a stable relationship—essential for development. A significant proportion of them have disorganised attachment, which is associated with negative outcomes. Therefore, interventions aimed at improving attachment security are needed. We conducted a case series study (involving five participants aged 8–11 years) in a newly established psychosocial rehabilitation daycare centre to describe the changes in attachment security and mental health of institutionalised children after one year of attendance. The intervention consisted of individualised care focusing on staff building a trusting relationship with participants using the principles of Trust-Based Relational Intervention^® (TBRI). Measures such as the Child Attachment Interview, SDQ, CBCL6/18, TRF6/18, and clinical interviews were used to follow change. The descriptive data of five participants are presented. All five children improved in mental health, and for two participants, organisation of attachment changed. Three children experienced relational ruptures. The findings suggest that psychosocial interventions that focus on building trusting relationships may be beneficial in institutionalised children. For these children, given their life history, it can be damaging to experience repeated breakdowns. Thus, the practical implication is that any new relationship for them with an adult should be established after an assessment of whether the relationship can be sustained.