The slim boy in the black vest at the right of the picture, allegedly the victim of a “napalm-type substance”, is looking into the camera and grinning broadly.
Compare the boy’s demeanour with that of Kim Phuc (final image below) the napalm bombing survivor known from a famous Vietnam War photograph who has said “napalm is the most terrible pain you can imagine”.
The same boy appears at 31:56 in Saving Syria’s Children, apparently moments after climbing down from the truck, running into the hospital with his jeans lowered and again at 35:15 exclaiming “cover me” while allegedly being treated for his injuries by Dr Saleyha Ahsan. (See further images below). 
If this boy’s injuries are not genuine then presumably those of the others arriving in the pick up truck with him – at least – are also fabricated. These include Mohammed Asi, of whom Ian Pannell has provided this image  purporting to show him “two weeks after the attack in hospital in Turkey” and Anas Said Ali whom the BBC claims died “a few days later in hospital in Turkey”.
In respect of all the alleged victims featured in ‘Saving Syria’s Children’, please note the existence and sophistication of HOSPEX “macro simulation” techniques and the personal connection which exists between Dr Saleyha Ahsan and an army officer in charge of running HOSPEX exercises.