The blast left the area looking like a war zone, with emergency workers rushing to the scene and scouring the damaged properties for survivors.
The most badly hit houses were numbers 9 and 11, with search teams discovering the dead body of Jamie inside number 11, where he lived with parents Kenny and Michelle.
Mr Partington, who is not related to the toddler, was airlifted to hospital suffering from severe burns. He remains in serious but stable condition, police said.
The family of a two-year-old who died in an explosion in Oldham, have described him as “a happy, loving little boy… full of laughter”.
Jamie Heaton died after what was believed to be a gas blast ripped through three houses and reduced them to rubble on Tuesday morning.
Police have begun a “homicide investigation” and have said they have “significant questions” for the boy’s neighbour, Andrew Partington, who was seriously injured.
Oldham explosion: gas pipes were not leaking, says National Grid
A mother who was hanging out the washing when a gas explosion destroyed her house, killing her baby son, desperately clawed through the rubble to reach him, it has emerged.
Video: 3 houses destroyed in massive explosion in the UK