Judicial officers use expert evidence in child protection court proceedings to inform decisionmaking about the welfare and best interests of children. There are many types of expert evidence, from different types of experts, and different jurisdictional arrangements for obtaining expert evidence in children's court matters. This paper presents research findings from Queensland, Australia, involving interviews with judicial officers and other professionals working in the children's court. The study found that it was considered vital for magistrates and judges to have access to information about child development, parenting capacity, and other factors relevant to care and protection decisions, but in practice, there were problems with the provision of independent expert evidence to the court. Legislative provisions enabling the court to appoint experts with special knowledge or skills were rarely used, so it was generally parties to proceedings (representatives of parents, children, or the statutory agency) who furnished expert reports to the court. The professional expertise of child protection caseworkers was not highly regarded. The findings raise questions about the availability and quality of expert evidence, the capacity of judicial officers to appraise such evidence, and the best arrangements for the court to obtain access to expertise. Implications Expert evidence from social workers and other professionals is vital to inform child protection decisions in the children's court.