"I think it's great because it means that infants that are bottle fed are going to get what they're supposed to get if the bottle that's being used for them has inaccurate markings."
"We don't babies who are having too many calories and we don't want babies who aren't having enough," she said.
Plunket was involved in developing guidelines for caregivers who bottle feed their children and staff have been alerted to pass on the information to affected parents.
"I think people themselves will not even have the remotest idea that this is an issue."
Consumer Affairs, part of the Ministry of Business, Innovation and Employment, was alerted to the inaccurate measures as part of regular product inspection work.
Fifteen of 35 bottles surveyed were then found to have inaccurate markings by more than 5 per cent. These bottles tended to be purchased from discount shops and were mostly unbranded bottles.
Bottles that meet the European regulatory standard (the EN14350 standard) have accurate volume measures, and these tend be more expensive than other bottles, said Dr Tuohy.
He advised caregivers using infant formula for their child to only buy branded bottles which comply with the EN 14350 standard.
Those wanting to use existing bottles can have them checked at their local pharmacy which has accurate measuring equipment.
