In the eighteenth century, Europe began to take stock of the horrific infant mortality in foundling homes and hospitals. Infant feeding and care became a major preoccupation for charities and philanthropic doctors. Some organized systems of wet nurses in the communities and institutions to provide for motherless children. 

At the same time, syphilis was becoming a serious problem in newborns. The sexually transmitted disease, which swept the continent following the voyages of Columbus, was known to affect babies born to infected mothers. Since the early sixteenth century, doctors had been convinced that mercury was of benefit.

Founded in 1724, the Vaugirard Hospital of Paris was the city’s home for orphans. By 1780 it had made room for mothers with syphilis and their children.  Sometimes the mothers died, or well-off families would abandon their sick children. Healthy wet nurses were engaged to feed these babies.

Eventually, the wet nurses were viewed as a technology—a vehicle--for administering mercury to the babies through their milk. Many of these healthy women fell ill, either from the mercury or by infection from their charges. Nevertheless, the practice continued into the nineteenth century. The wet nurses did not know (or were not told) that the children were infected. The physicians in charge of this experiment also attempted unsuccessfully to vaccinate the wet nurses against syphilis. That experiment also spread the disease.

Remarkably, some wet nurses brought suits against the doctors or the birth families. Occasionally they won damages, and finally the law was changed to offer greater protection.