Thousands of tonnes of contaminated baby formula have…been swept from shelves across China after 580 babies developed kidney stones from drinking it. Two have died so far, and that number could go higher still… The milk is produced by Sanlu, a company part-owned by…Fonterra…Speaking by video link from Singapore, Fonterra's chief executive says a trade recall of the milk powder began on August 2, but Chinese families were not told until last week, and only after Prime Minister Helen Clark intervened…Chinese investigators say raw milk was contaminated with melamine, a toxic chemical used in plastics, before it reached Sanlu…Fonterra's chief executive would not comment on a cover-up, but confirms the milk was sabotaged.