However he was found ten minutes later in the pond and pronounced dead at hospital.
Eyewitnesses described the moment the search was launched for the toddler, who had been playing at the secluded house in Newcastle.
A man who works in a nearby charity shop said: “Last night at about 7pm a girl came out of that house, she was frantic and we heard then from people on the street that a baby had gone missing.
“People were saying he’d been snatched.
“It was terrifying, the whole community came out and everyone was running around looking in the shops and doorways for a baby.
“I saw people with tears running down their eyes in panic.
“We were all looking for a little boy in a green jumper.”
The man added: “Then we heard he had been found in the pond and it was so tragic.
“Everyone is in complete shock about it.”
The house is a secluded stone property with a large garden and protected from the road by tall trees.
After he was found, Callum was taken to the Royal Victoria Infirmary in Newcastle, where he was pronounced dead.
Police confirmed they are treated the incident as non suspicious and are currently preparing a report for the coroner.
Northumbria Police Superintendent Mick Paterson said: “This is an incredibly tragic incident and our thoughts are with the family at this difficult time.
“They are understandably absolutely devastated and officers with specialist training are providing them with support.”
More Details: www.watersafetymap.co.uk/map/details/226
“Koi” by www.flickr.com/photos/pussreboots, license: creativecommons.org/licenses/by/2.0/