This situation analysis investigates the existing data collection, analysis, and reporting systems in the four priority states where the Nigeria Country Learning Hub will be focusing its efforts – Kano and Sokoto in the northwest and Borno and Bauchi in the northeast – to understand any bottlenecks and lags in producing data about reaching zero-dose (ZD) children in a timely manner for use at subnational levels and for reporting to the national level and to Gavi. In addition to generating and documenting evidence on the status of ZD children in Nigeria, this document will identify critical program barriers which must be addressed to ensure programs can successfully reduce the number of ZD children.