Around 1900 infant mortality rates (IMR) in Uruguay were among the world's lowest. By 1910, however, the IMR began a decades-long stagnation, while other countries experienced ongoing improvements. This article examines the conundrum of Uruguay's infant mortality stagnation, highlighting the leading causes of death – diarrhoeal and respiratory diseases – and their relation to social, economic and political conditions.
Drawing on an array of demographic, medical eyewitness and social sources, we explore why, despite Uruguay's precocious social welfare investments, its IMR stagnated and what enabled its eventual decline circa 1940. We conclude that a confluence of public health, medical and social factors enabled disease-specific improvements, but only after political pressure for large-scale redistribution of wealth was translated into extensive welfare state measures.