A University of Sydney study has brought out some of the risks in pregnancy among poor women.
Researchers found that women living in under-privileged areas and women who smoke carry a higher risk of having a preterm baby.
Older mothers also carry a risk of delivering a baby before the completion of the t full term.
The study showed that the chance of having a baby at least three months early is 45 per cent higher as compared to women residing in privileged areas.
The risk of having a pre-term baby was markedly higher for older mothers and Aboriginal women.
Lead author, Deborah Donoghue from the University's Centre for Rural Health said:
"Our study found a strong association between socioeconomic deprivation and an increasing risk of preterm birth in more than 800,000 babies, even after adjusting for other key determinants including maternal age, Aboriginality, smoking and clinical conditions," she said.