Autism Causes What Causes Autism Or How Is It Diagnosed To Young Children?

What causes Autism or How is it diagnosed to young children? - autism causes

My younger brother is four years and is a twin that was born and the first is the one who has autism, why did not he and my other brother, who can usually be the youngest of two ways, so that any problems or disabilties and how to diagnose what are the symptoms or signs to look for.