Explain these boundaries to your child. Tell him that during these tease-free periods he must express himself without resorting to sarcasm or jokes at someone else's expense. Ask your child's teacher for the titles of some age-appropriate books about the distress caused by teasing. Read and discuss them with your child. You should also scrutinize your child's environment for reasons he might be feeling anxious or fearful.
Middle childhood is a time of venturing into the new worlds of neighborhood and school.
Constant or inappropriate mocking of others suggests your child is having trouble adjusting. Finally, examine your own behavior and that of other family members. By this age, your child's inability to stop teasing may reflect his role models at home. At this age, there are lots of possible reasons. Developmentally, middle childhood is a time of dramatic change as formal schooling begins and kids learn more about what other people expect of them.