Children's hospital earmarked for upgrade

More sick children will receive treatment in western Sydney as part of a $619 million pre-election sweetener by the NSW government.

The funding, announced by Premier Gladys Berejiklian on Thursday, will go towards upgrading the Children's Hospital at Westmead and expanding its paediatric services.

The investment is estimated to create 6190 direct and indirect jobs during construction.

If the coalition is re-elected on March 23, the money will fund a new paediatric services building and the refurbishment of operating theatres and paediatric and neonatal intensive care units.

NSW Health Minister Brad Hazzard said the funding boost will greatly increase the capacity at the hospital.

"This significant additional funding will deliver both new and expanded health services for our state's sickest children," Mr Hazzard said in an statement.

Early construction works are expected to start in 2020.