This thesis studies whether the concept of child patients’ informed consent, deriving from Subsection 766(4) of the Estonian Law of Obligations Act, is applied in everyday medical practice in Estonia. It explores how doctors, children and parents conceptualise child’s consent and what their experiences are in this regard. For a better understanding of the concept of child’s informed consent, the thesis analyses the theoretical and normative background of children’s consent and autonomy in a broader meaning. The thesis also presents a short overview of empirical evidence with regard to children’s capacity to consent to clinical research and treatment.