It is generally normal for a 6-year-old child to talk to himself, or it may be a pathological condition such as autism.
As long as the child speaks fluently when talking to himself, the logic of language is not confused, and communication with the outside world is smooth, it is a normal situation; if a long time talking to himself, do not communicate with the outside world, more and more withdrawn disposition, it is an abnormal situation, and may be suffering from psychological disorders, such as autism, and so on.
Most children talk to themselves as they grow up, mainly because as their language develops, their ability to express themselves increases, and they subconsciously speak when they are active, showing the phenomenon of self-talk.
Parents can take the initiative to communicate with their children when they find that they are talking to themselves, slowly guide them and promote the formation of an optimistic mindset in their daily lives. If there are abnormalities in the child, such as unwillingness to communicate, stereotypical movements, or backwardness in intellectual development, he or she should go to the hospital in a timely manner in order to avoid delays in his or her condition.