Nearly 25 years ago, the world made a promise to children: that we would do everything in our power to protect and promote their rights to survive and thrive, to learn and grow, to make their voices heard and to reach their full potential. This year, as we approach the 25th anniversary of the Convention on the Rights of the Child (CRC), there is much to celebrate: from declining infant mortality, to rising school enrollment, to better opportunities for girls. In spite of the overall gains, there are many children who have fallen even further behind. Old challenges have combined with new problems to deprive many children of their rights and the benefits of development. To meet these challenges, and to reach those children who are hardest to reach, we need new ways of thinking and new ways of doing.