The right to health is guaranteed to children by the Convention on the Rights of the Child. This right encompasses every sense of the child's health in its physical, emotional, mental and psychological and access should be open to all categories of children. However, in reality, the measures of its implementation focus often enough on its dimension "physical welfare" of the child and the psychological aspect is often overlooked. Even in such a scheme, children in extremely vulnerable situation are not sufficiently covered by the health measures and such measures, where they exist, suffer from lack of adaptation to specific categories. In this study, it will analyze the contours of Article 24 and neighboring provisions (art. 25 and 26) of the Convention on the Rights of the Child, provisions on the right to health of children in general, first. Furthermore, the study will focus on the particularities of this right when it should apply in the case of particularly vulnerable children as are refugee children and / or unaccompanied children in conflict with the law, children involved in armed conflict and other children entering the same category. A third part will be dedicated to propose solutions for taking effective account access to the health of these categories of children particularly vulnerable.