China’s tainted milk scandal spread beyond the mainland to Hong Kong, as doctors in the city discovered a kidney stone in a 3-year-old girl, Bloomberg reported. The girl’s parents took her for a checkup after learning the milk she had been drinking for 15 months – made by mainland dairy firm Yili – may contain the chemical melamine. At least four children have died after consuming tainted milk products, and the number of hospitalized cases has risen almost ninefold to 12,892, according to CCTV, the state broadcaster. Of these, 104 patients are in a serious condition. A total of 39,965 children have visited clinics due to illness induced by the tainted products. Milk products made by Sanlu, the company first exposed in the scandal, are thought to be responsible for most of the hospitalizations so far. However, a further 21 Chinese dairy producers have been implicated, including the three largest: Yili, China Mengniu and Bright Dairy & Food.