Oh Dear, We Have Rogue Mod.....
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For more on marking an answer as the "Best Answer", please visit our FAQ.Moreover, they might have got the idea that milk could be drunk by humans because they'd previously used the milk from one species to suckle an orphaned animal from another.
When my friend was in Russia, she was given a cup of tea by a lady she met. It was very nice and the woman offered her a second cup. My friend then saw the Russian lady express breast milk into the cup. The point of telling that rather unpleasant tale being that it wouldn't have been any great mystery that breast milk was nutritious, and moving on to animals was no great leap of the imagination.
I doubt it was someone coming up with the idea completely out of the blue!