“…A significant concern in child mortality and morbidity is the poor level of vaccination, either because of fear of the side effects caused by the vaccine, lack of health centers in the area where the family lives, forgetfulness, lack of knowledge, poor information received, insufficient health education or indifferent on the part on the infant's parents/caregivers of the infant, which is why mobile applications are being developed whose function is to remind parents of child vaccination [14,22,25,26,27,28,29,31,32,34,36,37,38,39,41,42,43,45,46,47,49,50,51,52]. However, it is also being used as a vaccine safety control [53] and even more so with the issue of new vaccination technologies applied to COVID-19.…”