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In page Human–animal breastfeeding:

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In the late 16th century, Konrad Heresbach recommended that mothers rid their bodies of their first milk, called colostrum, rather than allow their babies to drink it.[4] The idea that colostrum was dangerous for a newborn further took hold in Europe when Thomas Newton wrote of its supposed dangers.[5] How widely this idea was accepted is unknown, but it could have been an additional purpose for human-animal breastfeeding as women sought a means to discard colostrum while establishing a milk supply for their baby.[citation needed]