The 26-year-old man and his partner, aged 20, were arrested soon after the baby was taken to Gloucestershire Royal Hospital by ambulance.
They were initially held on suspicion of attempted murder but following the baby’s death last night (Sun) at Bristol Children’s Hospital they have been re-arrested for murder.
A Gloucestershire police spokeswoman said this morning “The baby sadly died at Bristol Children’s Hospital yesterday evening.
“The man and woman arrested for attempted murder have now been arrested on suspicion of murder in connection with the case.
“They are still in custody.”
The family home close to Gloucester Cathedral has police tape around the garden today and forensic officers have been in the building.
“Police were called to Gloucestershire Royal Hospital at 11am on Saturday July 30 after concerns were raised for a baby’s welfare,” said the spokesman.
“A baby boy, aged three-months-old, had been brought to the hospital with serious injuries.
“We wish to reassure the local community that this is thought to be an isolated and contained incident, with no wider risk to the public.”
The family’s next door neighbour, who did not wish to be named, said “I knew nothing about it until I got home at about 6pm on Saturday after having a few drinks with friends and saw the police cars outside and the house cordoned off.
“I don’t know the couple at all well – just to wave to if I see them in the street. They have been living there about 18 months. The man is black and the woman white and their baby is mixed race – he’s absolutely beautiful.”
The neighbour’s wife said “I knew something was wrong when I saw an ambulance and a paramedic car outside yesterday morning at about 10am. Then later there was police blue tape around the front garden and a lot of officers coming and going.
“I don’t know the couple’s names or anything about them. I used to see her out sometimes when she was pregnant but only to say hello to. This is a terrible shock for us. It’s so sad.”