Two new studies led by researchers at the University of California, Berkeley, suggest that taking maternity leave before and after the birth of a baby is a good investment in terms of health benefits for both mothers and newborns.

A Productivity Commission issues paper says the costs of any natonal paid maternity leave scheme could be passed on by businesses to consumers and workers.

The union representing public servants says it is time for the Federal Government to revise its legislation and increase paid maternity leave to up to six months.

Pregnant women who have no access to maternity leave are more likely to have mental health problems than those who do.