A clinical investigation has found no evidence that milk powder made by a Chinese company caused three infant girls to grow breasts, China's Ministry of Health announced on August 15.

Ministry spokesman Deng Haihua said at a press conference that the probe found the hormone content of the milk powder to be within normal standards.

Earlier this month, parents and doctors in Hubei Province were reported voicing fears that milk powder produced by Nasdaq-listed Synutra International had caused at least three infant girls to develop prematurely.

Deng said food safety experts led by the Chinese Center for Disease Control and Prevention (CDC) tested 42 samples of Synutra products and 31 samples of dairy products from other producers.

Deng said the tests found no exogenous sex hormones in sample products, and the levels of endogenous estrogen hormones and pregnancy hormones found in the sample products were within normal range.