Police are continuing to question two men and a woman arrested after the death of a seven-week-old baby boy from severe head injuries.
Greater Manchester Police said they were not in a position to name the baby, who lived in the Clarksfield area of Oldham.
The 23-year-old woman, thought to be the child's mother, and a 35-year-old man originally arrested on suspicion of assault were rearrested on suspicion of murder and conspiring to pervert the course of justice.
A 26-year-old man is also under arrest on suspicion of murder and conspiring to pervert the course of justice.
Detectives have been given more time to question three people on suspicion of murdering a seven week old baby boy.
A warrant for further detention was granted at 6.30pm last night giving police a further 30 hours to question two men and a woman from Oldham, whose believed to be the baby's mother.
A post mortem examination revealed the baby died of severe head injuries.