Archer, 3, and twins Matilda and Hugo, 18 months, attend full-time child care as Ms Fullerton works more than full time in her two nursing jobs and her husband works 60 hours a week in his job.

Ms Fullerton estimates that increasing the child care subsidy for families with two or more children aged five and under to 95 per cent from its current 85 per cent threshold will save the family $150 to $200 a week.

"That's a weekly shop, or it means the kids can go back to swimming lessons or we can do more things as a family," Ms Fullerton said.

"We will have less financial stress and work about where we are going to pay daycare from. We are in well paying jobs, so I can only imagine the financial stress some other families are under."

Federal treasurer Josh Frydenberg said earlier this week announced a planned $1.7 billion injection into the childcare system to give families choice and make the economy stronger.

Under the plan, the current subsidy will apply to the first child from the family in care, but the level will increase by 30 per cent to a maximum of 95 per cent for subsequent children.

And the current $10,560 cap on the child care subsidy for families with combined incomes above $189,390 will be removed.

Mr Frydenberg said Treasury estimates the measures will help to boost economic growth by about $1.5 billion a year and provide the opportunity for up to 300,000 extra hours a week to be worked .

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The changes will come in to effect in July 2022.

Ms Fullerton said any financial relief for families would be a "breath of fresh air", particularly for multiple birth families facing double the cost for services like child care.

"So many people I speak to are in the same boat and it will mean so much."

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