It is now 10 years since the "European Declaration on the Health of Children and Young People with Intellectual Disabilities and their Families: Better Health -- Better Lives" was adopted by the World Health Organization. Through discussions with key informants and an online literature review, we reflect on actions and progress made in line with this Declaration to improve the health and wellbeing of children with intellectual disabilities and their families. Despite finding positive examples of policy, legislation and practice in support of children with intellectual disabilities, there are clear gaps and areas for improvement. Countries must continue to take action, as supported by the World Health Organization and other such organisations, in order to support children with intellectual disabilities in realising their fundamental human rights.