His face will turn red and he looks like he's going to pop. Occassionally, when in a
disagreement with his 11-year
sister, he will hit her.
He will hold on to emotions for a very long time. For instance, if we don't allow him to do something, like open a particular door, or whatever, he may start crying FOUR DAYS LATER and blurt out, "But I wanted to open the door!