A three-month-old boy has become the fifth person to die after Friday's Bourke Street rampage.
The baby boy died in hospital on Saturday night.
His death came as Melbourne's Jewish community mourned the death of 10-year-old Thalia Hakin who died on Friday after a driver allegedly sped through Bourke Street mall in a ramming attack that killed four and left dozens injured.
Two men, aged 25 and 33, and a woman, 32, also died on Friday.
The alleged driver, Dimitrious “Jimmy” Gargasoulas remains under police guard in hospital.
He is yet to be interviewed by police.
Thirty-seven people have been treated in Melbourne hospitals after the attack. Four remain in a critical condition.
On Friday, former Victorian police commissioner Christine Nixon revealed after the out-of-control car had missed her by less than a metre, she saw an upturned pram on the side of the road.
She went to check and found that it was empty.
The distraught mother had reportedly asked: "Where's my child?"
It is understood three children remain in hospital.