Child protective workers must be able to evaluate children's developmental needs in order to assess problems and delays. Skilful and comprehensive assessment leads to outcomes for children that promote their well‐being and development. This paper presents the findings of a qualitative study on a sample of Estonian child protective workers that investigated their assessments of the developmental needs of children in cases with child protection concerns. Only half of the child protective workers considered some dimension of the child's developmental needs in their assessment, suggesting a profound need to incorporate a developmental assessment framework and implement training of such in Estonia to increase child protective workers' competencies to conduct consistently comprehensive assessments.