It is not all that common, but there is a phenomenon where autism could get worse at about age two. There are some controversies whether regression is a prominent part of autism, but many people feel that it's very hard to diagnose autism before you can begin really talking in detail with a child.
Gerald FischbachAutism is a developmental disorder characterized by two main components: an inability to interact socially with other people with joint attention to understand other people's thoughts.
Gerald Fischbach