Well, sweetie, killing another person is never okay, and it's something that adults can do for many different reasons. However, when an adult or older person chooses to harm or kill a child, it's called child murder. Sometimes, people hurt kids because they are angry or frustrated, while other times they may do it because they are mentally ill and can't control their actions properly. Child murder is a terrible and deeply sad thing, and it's important to tell a grownup right away if you ever hear or see someone hurting a child.