“…Most studies were quantitative and observational in design [ 48 , 50 – 54 , 56 , 57 , 59 , 61 – 64 , 68 , 70 – 82 ], two used quantitative methods and implementation science in design [ 67 , 83 ], six used qualitative study design [ 39 , 49 , 58 , 60 , 69 , 84 ], and one study was a mixed-method research [ 66 ]. Studies on vulnerability in child health have examined the linkages between children’s vulnerability, infant mortality [ 48 , 62 ], sudden infant death [ 56 ], acute respiratory infection symptoms [ 61 , 71 ], poor health outcomes [ 70 , 75 ], nutritional status [ 53 , 57 ], and premature birth outcomes [ 55 ]. Drachler and colleagues, in their study, developed and validated a social vulnerability index (SVI) [ 52 ].…”