Foster said the child in this incident remained in a critical condition in Starship Hospital and no one could say whether he will survive or not.
"At this stage, we just don't know, he's in a very critical condition."
If he does, he is likely to be severely disabled and brain damaged, Foster said.
A Starship Hospital spokeswoman said the boy was in a stable condition at 4.30pm on Tuesday.
Foster said the family of the boy had reported the incident to police.
"We are appealing to extended family, or anyone within the family who may have more information to come forward," he said.
Police have been speaking to a number of people in relation to the boy's injuries, but would ask anyone else who may be able to help, to come forward.
"We would urge people to do the right thing by this child and help us work out exactly what's happened," Detective Inspector Foster says.
"Please let us know anything that may help, no matter how small."