Can a child with mild autism lead a normal life?

Pretty much. Milder forms such as aspergers are treatable. The experience and training of the child psychiatrist really matter. As does a supportive environment.
Depends on normal. A child with mild autism will have some defecits in intelligence and social behavior. He/she may not fuction well in regular society. That being said, it is quite possible that sich a person will find a niche in society and be happy and lead a productive life for themselves.