A similar proportion of parents with kids in long-day care are seeking alternative care arrangements within their families instead of paid childcare, the What Parents Want Survey by the Australian Childcare Alliance has found.
Of the 800 parents surveyed, 70 per cent said they would delay having more children because of rising childcare costs.
This is a big jump from 2010, when 35 per cent of survey respondents expressed the same sentiment.
Increasing childcare costs meant that 72 per cent of parents in the study were seeking alternative care arrangements within the family, compared with 38 per cent in 2010.
Alliance president Gwynn Bridge said grandparents would be burdened unless the government increased funding for disadvantaged parents or raised the childcare benefit for struggling parents.
"I am concerned that two-thirds of our parents say they may be forced to seek alternative care arrangements within their families," she said.
"This will, undoubtedly, place an unfair, unpaid burden on grandparents."
Do you agree a rise in childcare costs is delaying people from having more children?