Radioactive caesium of up to 30.8 becquerels per kilogram was detected in baby formula manufactured and sold by Meiji Co, local media reported.
Meiji suspected a link with the radiation leaks from the Fukushima Daiichi Nuclear Power Station, which was hit by the March 11 earthquake and tsunami, Kyodo News reported, citing unnamed sources.
This is the first time since the disaster that radioactive caesium has been found in baby formula, according to the Health Ministry.
The level of radioactive caesium contained in the product was below the official limit of 200 becquerels per kilogram.
But babies are more vulnerable to harmful effects of radioactive material than adults.//DPA