Thinking is best observed when a child is faced with a problem that is not easily solved. For example, a child wish to play with a toy inside a box. He can't get it to open. Does he give up after 1 or 2 tries? Or does he try different ways to get it opened, including going to an adult to ask for help? Giving up easily is a negative thinking habit.
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I think you will find out by the way he talk. When something happen that make him worried, learn his reaction. If he has tendency to be paranoid then it might be a sign