One witness described waking up “really scared” to hear people screaming and cracking noises.
“My partner saw the fire and just told me to rush and get [the] baby – so we just left the house, grabbed whatever we could get at the time,” she said at the scene on Friday morning.
In a statement, police said the units and a neighbouring complex in Haig Street were evacuated, with “substantial damage” caused by the fire.
A Queensland Ambulance Service spokesperson said paramedics treated seven people for smoke inhalation, including two women.
Investigations into the cause of the blaze are ongoing.