Human rights groups say more than 100 children have been killed in the six months since the crackdown on Syria's pro-democracy movement began.
Activists say one of the children killed by security forces was Tamer Al Shrei, 15, who was arrested on April 29.
His father, who found his body in a morgue more than a month later, will have his testimony heard at the UN-backed Human Rights Commission in Geneva on Monday.
Mohammed Al Shrei spoke exclusively to Al Jazeera's Charles Stratford about his son's death.
WARNING: The report contains strong images which some viewers may find disturbing.