Retailers introduced the restrictions last year after concerns baby formula was being purchased and on-sold for profit overseas,particularly in China,causing supply shortages for Australian families.
Tegan Shirbin,a new mum to twins,said she has had great difficulty feeding her 11 week old babies,Octavia and Troy,who have to be solely formula-fed for health reasons.
The Googong mother said in just the past few weeks she had five arguments with supermarket staff who have tried to stop her from purchasing more than two tins of formula.
Ms Shirbin said her twins consume two tins in about four days and supermarkets needed to realise parents of multiples needed more than the limited amount of formula.
"I have to take what I can get because I don't know when I'll be able to get[to the shops] again,"Ms Shirbin said.
"I have double the babies,I should be able to get double the formula."