According to the backinfo I got, this Rohingya child was burnt in an attack by Burmese military and Border Guard Police in the town of Maungdaw, Rakhine State in Myanmar (formerly known as Burma). Rohingya are a Muslim minority in Burma.
How much of the allegation is true I have no means to know. All that is certain from the video is that tha child was indeed badly burned and could suffer serious skin infections if not taken to hospital promptly and provided adequate medical care.
Props to Best Gore member @AkramGdr for the video: