Of the 2875 papers identified, we included 112 studies with qualitative data on barriers to and enablers of kangaroo mother care (Fig. 1). Most of the studies were published between 2010 and 2015 (66; 59%) and had less than 50 participants (67; 60%). Nearly half of the studies were surveys or interviews (50; 45%). Forty studies (36%) were conducted in the WHO Region of the Americas; 29 (26%) in WHO African Region; 64 (57%) in countries with low neonatal mortality, defined as less than 15 deaths per 1000 live births;8 48 (43%) in urban settings; and 67 (60%) at health facilities. Many studies did not include neonatal characteristics such as gestational age (68; 61%) or weight (75; 67%; Table 1). The majority (68; 60%) of the studies appropriately addressed at least four of the five quality domains.