Focus group discussions with mothers, fathers and grandmothers of young children across three time points in areas where an IYCF social and behaviour change intervention was implemented in Nigeria explored differences by participant type and shifts over time in attitudes, beliefs and social norms related to breastfeeding and dietary diversity (DD). Overall, across time points, researchers found more discrepancies in attitudes, beliefs and social norms for early initiation of breastfeeding (EIBF) and exclusive breastfeeding (EBF) among different participant types than for DD.