Background The parent-infant relationship plays a central role in early emotional, cognitive, and social development. Difficulties in bonding, interaction, attachment, or parental sensitivity during the first two years of life may have lasting consequences for children and families, making early identification essential for timely support and intervention. Although a range of instruments has been developed to assess parent-infant relational processes, the evidence remains dispersed, and no comprehensive mapping of instruments specifically applicable from birth to 24 months has been identified. This scoping review aims to map the instruments used to assess parent-infant relationships during the first 24 months of life and to describe their main characteristics. Methods This scoping review protocol follows the Joanna Briggs Institute methodology for scoping reviews. Studies describing instruments used to assess the parent-infant relationship among parents of typically developing infants aged 0–24 months will be considered across any clinical, community, research, or cultural context. Eligible instruments may assess bonding, interaction, attachment, parental sensitivity, or related relational dimensions. Studies involving preterm infants, infants with medical conditions or developmental disorders, or instruments focused exclusively on parental stress or mental health without explicit assessment of relational dynamics will be excluded. A three-step search strategy will be used to identify published and unpublished studies and grey literature. Two reviewers will independently screen records, extract data using a piloted charting form, and summarise findings in tables and descriptive narrative form. The final scoping review will be reported in accordance with the PRISMA extension for Scoping Reviews (PRISMA-ScR). This review will provide an overview of available instruments, their characteristics, contexts of use, psychometric properties, adaptations, and short-form versions. This protocol is registered in the Open Science Framework (DOI: 10.17605/OSF.IO/HRVX9).
Brandão et al. (2026) studied this question.