An investigation has been launched into the deaths of two new born babies thought to have been fed with infected intravenous drips.
The infants were patients at Mainz University Hospital in Germany.
Hospital officials said in all 11 children had been given nutritional infusions which may have been contaminated with unspecified bacteria.
Five of them are said to be in a critical condition
The babies who died were already seriously ill and in an intensive-care ward.
According to the hospital the infusions had been individually prepared for each patient in the hospital pharmacy department using components from a commercial supplier.
New products from a different manufacturer are now being used.