NSW Premier Gladys Berejiklian says she is willing to reopen discussions about changing the law so that the state can pursue charges against a person who kills an unborn baby in a crime.

She described a recent horror car crash that claimed the lives of two young women - one of whom was heavily pregnant with twins - as a "wasteful loss of life" and said she would seek advice and public feedback.

Katherine and Bronko Hoang married just months before the tragic crash. Credit:Facebook

Katherine Hoang, 23, was just a week away from giving birth when Richard Moananu, 29, allegedly ploughed his Mazda 3 into her Nissan Tiida, killing her, her babies, a 17-year-old relative and injuring her husband.

Police charged Mr Moananu with 10 offences, but were unable to pursue more than two counts of manslaughter because under NSW law the loss of a foetus following a criminal act is regarded as a "serious injury" to the mother.