Fonterra says it is "extremely disappointed" that China's Beingmate Baby & Child Food, in which it has an 18.8 per cent stake, has issued another earnings downgrade - this time to a loss of $171-$214 million for the December 2017 year.
The previous forecast was for a loss of RMB350m to RMB500m ($75m to $107m).
Fonterra said it was assessing the implications the loss would have on its first half result.
"As an investor in Beingmate, we are extremely disappointed by this announcement and the on-going performance of the company," Fonterra said in a statement.
The co-op said it was seeking more information on the forecast downgrade in addition to receiving Beingmate's full-year financial statements.