Police have named the baby boy who was murdered at a house in Brompton Park in north Belfast on Tuesday 27 July, as Liam O’Keefe.
Detective Chief Inspector Millar said: “A 29 year old woman arrested on suspicion of murder and attempted murder has now been released from hospital and transferred to police custody for questioning.
“The other young child injured during this incident remains in hospital where her condition is described as stable.
“I would like to thank the local community for their unwavering support and patience while we continue our investigation into the tragic events of Tuesday evening.
“I continue to ask that anyone who has any information to contact us on 101 quoting reference number 1787 of 27/07/21.”