MERTIL for Parents: Pilot Study of an Attachment and Trauma-Informed Online Parenting Program

Background: Early relational health is critical for childhood development, and disruptions in infant-caregiver trust can heighten risk. MERTIL for Parents is a brief, universal, online program designed to build parental understanding of relational trust and its role in infant development. This pilot study is the first evaluation of the program. Objectives: To evaluate the acceptability and short-term outcomes of MERTIL for Parents. Methods: Seventy-three parents (n = 69 mothers) of children aged 0–5 years, referred by practitioners, completed the program and online questionnaires at baseline (N = 73), post-intervention (n = 50), and three-month follow-up (n = 25). Results: The program demonstrated high acceptability: 98% of parents who engaged with the program found the content useful, 92% felt the length was appropriate, and all would recommend it to others. Program completion and satisfaction did not vary by sociodemographic or psychosocial characteristics. At three-month follow-up, parents reported significant improvements in their enjoyment of the parent–child relationship (p < 0.001), attunement to their child (p < 0.001), parenting confidence/competence (p = 0.004 and p = 0.003), help-seeking amenability (p < 0.001), and a reduction in irritability toward the child (p < 0.001), with medium to large effect sizes. No significant changes were observed for items assessing reflective functioning or perceived rejection. Conclusions: MERTIL for Parents shows strong acceptability and promising preliminary outcomes as a scalable, attachment and trauma-informed intervention supporting early relational health. Future research should examine long-term impacts and evaluate broader implementation across diverse families and service contexts.