The child is understood to have been known to Kerjean and police say they believe the incident took place "within a family setting".
"At this stage, we are not looking for anyone else in connection with the incident," the police spokesperson said.
On Thursday, several bouquets of flowers were left at the entrance to Syward Place, an apartment complex located on the corner of Pyrcroft Road and Bell Bridge Road.
Det Ch Supt Jon Groenen described it as "a tragic incident", adding that teams were "working hard to build a picture of what happened", while a significant police presence will remain in Pyrcroft Road over the coming days.
"We appreciate that all this will be concerning for residents and we would like to thank them for their co-operation as we conduct our investigation," said Groenen.
Additional reporting by PA Media
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