Not pasteurized
We’re not sure what kind of relatives this woman has, but we can guess they aren’t the most educated in the world. Do they believe that women should milk themselves, process the milk, and then nurse their children? What was it that they were drinking? Was she there when they spoke these words?
It makes little sense to consider what kind of procedure that would be, or what it would accomplish other than making the baby wait for no apparent reason. We find it ridiculous that someone could blame a woman for her child’s illness because the breast milk was not pasteurized.