The child died at an address in Lovett Avenue on Thursday despite treatment by paramedics.
A 13-year-old boy has been stabbed to death at a house, sparking a murder investigation.
West Midlands Police officers were called to an address in Lovett Avenue, Oldbury, at about 4pm on Thursday.
The child died despite being treated by paramedics.
Detective Superintendent Shaun Edwards, from the force’s homicide team, said: “It’s absolutely tragic a young life has been lost.
“We have specialist officers who will be supporting the family of the boy.
“We have detectives working flat out to find whoever is responsible and bring them into custody as soon as possible.”
