My sister always likes to crush chalk. What is this bad habit?

When parents face such problems, they can't just ignore them, do nothing, and force them to discipline and correct them. Method is very important. For example, a dentist once said that his two or three-year-old children often beat people and asked him if he was normal. I said this is normal, very normal. But don't worry because it's normal, okay? Obviously not, parents should reflect on the problem, understand the child's situation, analyze the reasons and tell the child some solutions. When there is a contradiction, can we solve the problem through consultation and correct the child's behavior? If it is because the child's body can't control himself, he can learn Taekwondo or something else to adjust his body control. When children have these stage characteristics, it is easy for parents to have problem behaviors regardless.