ITH Pharma is "very saddened" by a baby's death at St Thomas' Hospital in London that officials have "strongly linked" to one of its products and the firm is co-operating fully with the investigation, managing director Karen Hamling said.
Parenteral nutrition, manufactured by ITH, is supposed to deliver a variety of nutrients intravenously when a baby is unable to eat on its own.
A Public Health England spokeswoman said investigations with the company have identified "an incident that might have caused the contamination".
Questions have been raised over how a batch of intravenous fluid could potentially have become contaminated, after the death of one baby.
The suspected contaminated batch of a food supplement linked to the blood poisoning of 17 babies, was sent to 22 hospitals.