Autism or??? Help

Shaela

Hi everyone, I know this may be a sensitive subject for some but I am hoping to get a little feedback. If you have an autistic child, when did you know? When exactly could you tell? When exactly were the 1st signs of something being different to you about your child behavior, interactions, reactions etc.?? What were his/her actions that you felt told you the most? What age? Thank you so much!!