By helping healthy people stay healthy, vaccines remove a major barrier to human development. Immunised children are more likely to attend school and live healthy productive lives. By reducing illness and long-term disability, vaccines also generate savings for health systems and families. We worked with a global charity focused on child survival to develop an ambitious immunisation advocacy programme. Oshun helped to mobilise international institutional support, build strategic business partnerships, facilitate government engagement and ensure community support for immunising children in 120 countries.