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.