Infant mortality over time
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Infant mortality is the death of newborn children under the age of 1.
In 1990, about 8.8 million infants younger than one year died worldwide. In 2015, this number almost halved to 4.6 million infant deaths.
The map below created by OurWorldData.org shows how infant mortality had changed from 1950 to 2015.

The continent of Africa has the highest infant mortality rate (about 68 deaths per one thousand live births). But in recent years, child mortality has declined rapidly in Africa as well.
The map below created by Reddit user Abu_doubleu shows the massive decrease in worldwide infant mortality from 1950 to 2020 is perhaps one of humanity’s most outstanding achievements.

In the United States, like in other developed countries, the leading cause of infant mortality was birth defects.
Worth comparing USA and EU even by 2015…