Reducing the number of zero-dose and under-immunized children requires accurate, specific, and real-time data. However, to date, few immunization information systems have been designed explicitly with zero-dose children in mind. On July 12, 2023, MOMENTUM Routine Immunization Transformation and Equity held a learning exchange webinar to discuss a landscape analysis of existing and novel data systems that can be used to identify, monitor, and reach these children. The webinar included an in-depth exploration of the analysis by one of its authors, Allison Osterman.