Parents of the babies with kidney stones tell the reporter about their kids' drinking state at a military hospital in Lanzhou, capital of northwest China's Gansu Province, Sept. 11, 2008. So far this year, Gansu Provincial Health Department has seen 59 kidney stone cases in infants, and at least one baby died as a result of kidney stones. Most of them live in rural areas of the province. There were no such cases in 2006 or 2007. [Xinhua]

The number of babies sick in a milk powder scandal in China continues to grow as at least seven provinces are now reporting cases of kidney stones in infants.

National food and health authorities are trying to find out if all the babies drank the same brand of milk powder. Samples had been sent to a state-run lab for analysis.

A spokesman for Sanlu Group, whose formula was suspected to be related with the case, said they were keeping a close eye on the case and were ready to cooperate with investigations.

More than 1,000 employees were conducting their own investigations throughout China. The group was waiting for resultsfrom lab analysis.

The spokesman promised an immediate report to the public about any progress in the investigation.