Indeed, not all of the experiences that the folk has drawn or the grandparents' words are false and outdated. The ancients were very good at observing the phenomena in life, from nature to society, to make their life easier.
According to Our World In Data, 56 million deaths were recorded in 2017. Ten percent of those were children under 5. This number was even higher than that of those who died at 50, 60, or 70 years old. To make it clear, the total death cases from 5 to 45 years of age just added up to that of children under 5.