My son is three years old and now he is always talking to himself. He ignored everything others asked him. Will there be any problems?

It's normal not to need to see a doctor. Children in this period have the ability to think and distinguish. Sometimes they often talk to themselves in their own world, and sometimes they seem to deliberately ignore others. You can take your children out to play, such as a children's playground or a place with many children, so that children can communicate more.