Later, another photographer captured Habak in tears, kneeling beside the body of another young victim, overcome by the "indescribable" scene he had just witnessed.
Every so often, a photograph cuts through the grim cacophony of the war in Syria and pierces viewers' hearts. However, Habak saw that he was breathing, though barely.
The Aleppo-based activist-videographer was caught in the middle of a massive suicide attack on a convoy of buses evacuating Syrians from a rebel-held area on April 16.
"What I and my colleagues have done today is what inspires our humanity to those who were partners in killing the children of Khan Sheikhan", Habak tweeted, referring to the recent gas attack by Syrian regime. His camera, still on, was recording the chaos.
"The scene was frightful - especially seeing children wailing and dying in front of you", he said.
He picked him up and began to run towards safety.
IS launches chemical 'gas attack' in western Mosul
USA -backed Iraqi forces are battling Islamic State militants in the more densely populated western half of Mosul. Isis overran the city in the summer of 2014 in a lightning advance which routed Iraqi forces.
"This child was firmly holding my hand and looking at me", Mr Habak, 24, told CNN.
Habak, who was dazed by the noise, did not fear for his life and rushed right in to try and rescue the children. "So I decided along with my colleagues to put our cameras aside and to start rescuing injured people".
An image taken by another photographer, Muhammad Alrageb, shows Habak dashing towards an ambulance, the child and his camera in his arms. But according to CNN, Habak didn't immediately start taking photos. He said it was to ensure accountability. But then there are people who make all the difference with their deeds of courage while helping others at the risk of their own lives.
He bravely ran back to the scene to see if he could save anyone else.
The photographer, unlike his peers, chose to leave behind his camera to attend to injured and dead children after a bomb blast rocked Rashidin, west of Aleppo, and killed around 126 people, including 80 children. Overwhelmed, Habak collapsed. An image, shot by another photographer, shows him on his knees sobbing near the boy's body.