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Theirs is the kingdom of heaven

For many centuries, one in three newborns did not survive up to their first birthday, and details and causes of their death were unknown. Pioneers of vital statistics were Graunt and Petty in Britain, Süßmilch in Prussia, Berg in Sweden, Quetelet in Belgium, Villermé in France, Bodio in Italy, and Woodbury in the US. Since 1860, halfway reliable records were available, and infant mortality, at that time ranging from 100 to 300 per 1000 live births, was perceived as a humanitarian and political problem. Variables identified as associated with infant mortality included artificial feeding, poor sanitation, parental social and marital status, male sex, ethnicity, prematurity, and others, although their precise mechanisms often remained unclear. Since 1860, a dramatic and sustained decline in infant mortality caused a demographic revolution. Recent infant mortality rates ranged from 2 to 12 per 1000 live births in developed countries. Most of this reduction was achieved through public health measures and improved sanitation. Only since prematurity became the major cause of mortality could medicine claim to have enabled most of this progress.