Police are investigating how a toddler drowned in a pond close to a garden where he had been playing with family.
The three-year-old boy was found floating face down and unconscious in the water at the back of a house in Moseley. He was discovered an hour after being reported missing.
Family, friends and police mounted a frantic search after he vanished from a gathering on Saturday evening.
He was spotted from the force’s helicopter at 5.30pm in the back garden of the detached property in Anderton Park Road.
The property backs onto the Coppice Road home of his aunt and uncle, reported to be Martin Hockley, aged 51.
Despite efforts by police and paramedics at the scene, he never regained consciousness and was pronounced dead at Birmingham Children’s Hospital.
The homes are separated by a fence and it is understood the investigation will focus on whether the boy was able to open gates which link the gardens by an alleyway, although they have ruled out suspicious circumstances.
A West Midlands Police spokesman said: “It looks to have been a tragic accident.”
The boy has not yet been named by the police.
The boy’s family has been too upset to speak since his death in the intensive care unit at the hospital.