This group of researchers from Christchurch describes the usage, impact and reach of their online education tool designed to prevent sudden infant death. They formatted a 24-slide presentation for online access, which was designed for mainstream audiences and intended to align current knowledge, attitudes and actions for a blitz approach to preventing sudden infant death in NZ. Between 18 November 2009 and 31 December 2011, 3286 online sessions were completed, 2683 (81.7%) of which had complete data. Average usage was 24.4 completed sessions/week over the 2-year study period, at a cost of NZD1.11 per completed session. Usage reached across regions, ethnic groups and roles. On completion of the course, most respondents (68.8%) rated highly (7–9/9) their ‘increased confidence’ to discuss infant sleep safety with others. A high increased confidence rating was significantly influenced by spending more time per slide and being Māori, Pacific, Asian or ‘Other’ compared with New Zealand European.