I have a 4 year old boy with Autism and a "normal" 2 year old. She is almost 3 and speaks only a very few words but I am not worried, I know she is just taking her time. My son was 18 months old and non verbal, that was his only symptom of Autism then but I knew something wasen't right. He was happy, no tantrums, lots of eye contact, loves to be held and cuddled, but wasen't talking, everyone thought I was being " too motherly" But you just know when things aren't right, now I have speech therapists and others breathing down my back to put my daughter into some kind of therapy, I know there is nothing wrong. A mother just knows. With my son, I knew, with my daughter I have no worries. She just has nothing to say!!