Greater Manchester Police say they have formally identified a seven-week-old baby who was admitted to hospital on Sunday with severe head injuries, and subsequently died.
They are not releasing the baby's name or photograph at this stage.
Greater Manchester Police have said they have established a scene on Hillside Avenue in Oldham in connection with the death of a seven-week-old baby.
Three people have been arrested following the death of a seven-week-old baby.
At 2.10am on Sunday 26 January 2014, police were called following reports a baby boy from the Clarksfield area of Oldham had been admitted to hospital with severe head injuries.
The baby later died at The Royal Manchester Children's Hospital. A post-mortem examination later revealing he died from serious head injuries.
A 23-year-old woman, a 26-year-old man and 35-year-old man have been arrested on suspicion of murder and conspiring to pervert the course of justice.
– Detective Inspector Andy Cunliffe from GMP’s Major Incident Team
"This is a tragic case in which a very young baby has lost his life and we are determined to find out exactly what the circumstances were that led to him suffering such injuries.
"News of the death of such a little boy will no doubt come as a great shock to people and I would like to try and reassure the community as much as I can that we have a team of detectives dedicated to working on this investigation, and they will today be interviewing the three people in our custody."