Sometimes, another lactating woman was available, and for many babies professional "wet nurses" were their saving grace. At various times throughout history, wet nurses – women who breastfeed babies professionally – have existed as a thriving industry of their own, complete with references and medical exams. But once bottles that could be sterilised and rubber nipples were invented, later on in the 19th Century, European and US parents seem to have stepped away from wet nursing as an alternative. Now the feeding vessels could be made safe: it was time, instead, to think about the contents.

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