In elie wiesel's "night": why did the officer take such an interest with younger children?

The leader of the camp and the head of Eliezer's tent both take a special interest in children and give them extra food. Eliezer explains that children are traded among homosexuals at the camp. When Eliezer arrives at the camp, it seems empty. As usual, the prisoners shower and are given new clothes. Veteran prisoners tell them that Buna is a good camp and that they should try to avoid being placed in the building unit. The head of Eliezer's tent is a fat and predatory-looking German. His assistant tries to get Eliezer's shoes by offering to put him and his father in the same unit, but Eliezer refuses, even after he offers an extra ration of food.