A Melbourne mother has described how her son turned grey when he became seriously ill after drinking raw milk.

The one-year-old boy suffered kidney failure after contracting hemolytic-uremic syndrome - a serious complication of an E.coli infection.

Mountain View Organic Dairy Bath Milk. Credit:Eddie Jim

He was one of four children to develop potentially-fatal strains of gastroenteritis after drinking unpasteurised milk, sold as "bath milk". A fifth child, from the Mornington Peninsula, died after drinking the same milk.

The Melbourne baby's mother, who spoke to Fairfax Media on the condition of anonymity, said her son developed diarrhoea and vomiting, which lasted 10 days, after he had sips of her smoothies made with Mountain View Organic Bath Milk.