Twelve teams of four data quality auditors, independent of other project staff, were recruited to track data quality obtained from communities. Each team comprised of three females and one supervisor. Over the life of the project, the teams visited all the participants recorded with at least one birth—that occurred during the project—in the 42 wards of the three intervention and one counterfactual LGAs. The data auditors also sought for and compiled information on omitted mothers and births. The auditors were expected to directly inquire of a participant—or an informed family member - in the event of a maternal death—if a CBHV and CBHV Supervisor visited, the status of newborns, alive or stillborn, and if head circumference was measured within seven days among live births. With participants' responses as the gold standard, births, status of births, and confirmed head circumference measurements were verified.