The physique of the toddler was found in a backyard in Weston-super-Mare, Somerset, on Saturday.
Avon and Somerset Police stated a person and girl had been arrested in reference to the incident and remained in custody.
Detective Chief Inspector James Riccio, who’s main the investigation, stated: “As a result of important developments on this investigation, I can affirm we’re now treating the child’s loss of life as a possible murder.
“A person and a lady have been arrested and they’re in custody for questioning.
“A forensic autopsy examination shall be held later this week however we don’t anticipate any conclusive outcomes for a while.
“I do know this growth will trigger concern in the local people, significantly in gentle of the tragic circumstances, however I’d stress that whereas that is being handled as a possible murder, we’re conserving an open thoughts and can at all times be led by the proof.”
Mr Riccio praised the local people for his or her “wholly supportive response” for the reason that investigation was launched.
“Our neighbourhood workforce shall be finishing up further reassurance patrols of the affected space, so please cease an officer and communicate to them when you have any worries or questions. We’re right here to assist,” he stated.