CNN did a follow up on this story earlier this week in their program BackStory. They got hold of the complete footage from the Gaza hospital and brought in two american ER pediatric doctors to review it.
http://edition.cnn.com/video/#/video/bestoftv/2009/01/22/bs.holmes.gaza.boy.death.cnn
The additional footage and the comments by the doctors should leave no doubt about this being authentic. One has to be pretty cold hearted and in denial of the consequences of high intensity combat in a densely populated urban setting to claim otherwise.
http://edition.cnn.com/video/#/video/bestoftv/2009/01/22/bs.holmes.gaza.boy.death.cnn
The additional footage and the comments by the doctors should leave no doubt about this being authentic. One has to be pretty cold hearted and in denial of the consequences of high intensity combat in a densely populated urban setting to claim otherwise.