Being teased by a brother or sister is typical in most family units and a part of growing up and learning to deal with people.

However, according to a study in the July 2013 issue of Pediatrics, it can be harmful to a child's mental health if it's taken too far.

According to the authors of the study, while bullying by peers is a recognized problem, bullying by siblings often is dismissed as normal.

Parents, pediatricians and the public should treat sibling aggression as potentially harmful and not dismiss it as normal, minor, or even beneficial. Special guest, Dr. Robert Sege, MD, joins Melanie Cole to explain the difference between normal sibling play and the next level of bullying, as well as discuss why the message of sibling bullying should be included in parenting education.