“There have always been cases in which infants have not been able to be breastfed,” Rima Apple, professor emerita of women’s studies and nutrition at the University of Wisconsin-Madison School of Human Ecology and author of Mothers and Medicine: A Social History of Infant Feeding, 1890-1950, tells Yahoo Life. “Mothers die; mothers are ill; for some reason a baby can’t latch on.” Often, centuries ago, one solution was to hire a wet nurse, she explains, although that came with a vast range of problems, from fleeting availability to the fact that anyone employed as a wet nurse would likely need to neglect her own baby’s needs in the process.