Nearly every day, a parent asks me if their child is "normal" or whether their behavior is normal for a child their age. Some parents instinctively sense that their child is different, and they are seeking a professional to confirm that for them. It may be a relief for the parent to know that, indeed, their child is different in some important way that affects their functioning (in school, at home, in the community), and that they are not just imagining it.
There is such a wide spectrum of what I would call "normal" behavior for most children, and that is greatly affected by their chronological and developmental age. Their life experiences, as well as their genes, will determine how and what their behavior is. Certainly, children who have more challenges in their lives (whether they are born prematurely, or born with a physical disability, or born into a family with domestic violence or poverty, and have a history of trauma, abuse, or neglect, etc.) will likely need a great deal of understanding, compassion, and patience to help them to be successful. By successful, I am referring here to his or her ability to cope with the stresses of life and to learn from his or her mistakes.