Objectives: to validate the vulnerability markers of dysfunctions in the socioemotional development of infants.
Methods: study with a sequential exploratory mixed-method design. The vulnerability markers elaborated in the qualitative phase were analyzed by experts in the quantitative phase using the Delphi technique with a minimum consensus of 70%. Seventeen judges answered the questionnaire in the first round of analysis and 11 answered in the second round.
Results: in the first round, two markers did not reach minimum consensus: the presence of instability in family relationships (66%) and delinquency and/or drug abuse by parents/caregivers (65%). In the second round, all markers were validated, with more than 90% agreement in most of the attributes, and reached the minimum consensus of 73%.
Conclusion: the eight vulnerability markers reached the minimum consensus for validation, and a relevant instrument for infant care can be developed after assessing the reliability and clinically validating these markers.