The boy was found with serious injuries at an address in Coventry on Tuesday evening.
A woman has been arrested on suspicion of murder after the death of a five-year-old boy in Coventry
Police said the suspect is understood to have been known to the child.
The boy was found with serious injuries at an address in Poplar Road, Earlsdon, just after 5.55pm on Tuesday.
He was confirmed dead at the scene.
A 49-year-old woman has been arrested and taken into custody for questioning.
Coventry police said a cordon is in place in the area as they investigate.
Superintendent Ronan Tyrer said: “This is an absolute tragedy and our thoughts are with all those impacted by this terrible passing.
“The loss of any life – especially one so young – is always extremely painful and we know this will cause a lot of shock and concern.
“A suspect has been arrested and it’s important we allow time for detectives to fully investigate the circumstances around the death.
“We’ll continue to have a policing presence in the area and do our best to support everyone during this difficult time.”