They want to test the rules. It is normal for children to challenge limits. Children may break rules because they are angry, in need of attention or not yet able to control their desires. They don't feel well. Children, like everyone else, feel sick, hungry, tired or upset.
Children lack the skills to express their needs and wants.
Try to understand the cause of your child's behavior. This can help you choose the best way to respond. Encourage good behavior. This helps stop misbehavior before it starts. Talk with your child often.