That is an adult arm pinching that baby. You can tell by the size of the depression in the skin and the shape the fingers are in. I don't think the red spot is a burn but a discoloration in the photo. The shadow of the hand is also surrounding the spot. You can see the similar red discoloration in the arm of the adult. Question, what is the body part above the left arm that is cut off at the top of the picture? It almost looks like part of a breast. Sick fucks!