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Initial reports indicated a 10-year-old girl and a six-year-old boy were last seen near Mirambeena Drive in Pimpama around 8.50am on July 18.
They are both described as Caucasian, with brown hair and brown eyes.
Now, police have also released a photo of a missing seven-week-old baby girl.
Another image is of 41-year-old Monique, who the children are believed to be with.
The children are known to her.
Monique is described as Caucasian, with dark brown hair and brown eyes.
They are believed to be travelling in a white Nissan X-Trail with Queensland registration 992XPS.
Police believe the group may be in the Tenterfield area of New South Wales.
Police are urging Monique to come forward and contact Policelink on 131 444.
Anyone who may have seen them or the car is also urged to contact police.