This toolkit is designed to help companies develop trustworthy AI for children and youth. It provides a checklist for C-suite and corporate decision-makers to consider and actions they can take to ensure AI is developed in a responsible and ethical manner. The guide for product teams includes foundational principles and a challenge to define children and youth. An AI labelling system and guide for parents and guardians are also provided, along with benefits and risks. The toolkit concludes with a list of contributors and endnotes.