Here's a list of signs my kids (one or both) have shown that lead us to get them tested and diagnosed.
-Lack of eye contact
-Lack of speech or lost speech (saying words but then losing them from their vocabulary)
-Doesn't point to people, objects or pictures in books or wave (this was by or around 12 months)
-Lack of pretend play (not being interested in using the play phone properly, no interest in playing house or with babies, not using the toy cars or trains for their intended use).
-Self Stimulation or "Stimming". Mine vary on this, one does a lot of hand gestures (flickery or fluttering of hands) or movements and the other will spin items or spin themselves in circles (repetitious movements).
-More interested in the details of a toy rather then playing with the toy.
-Sensory or texture issues. Addison needs to touch or lick everything, even non-food items. Jordan doesn't like to get dirty, so he will avoid sticky or wet food textures unless its on a spoon.
These are just the signs for my own children, here is a complete list of signs you can look for if you suspect your child could be on the spectrum. The list I mentioned is from Mayo Clinic's website and it gives you a good idea of what you need to be looking for and what steps you should take from there.
I have decided to start my own blog about our journey with Autism, just so that this blog can remain a place for my kids and their adventures. My blog is just getting started and is called Organized Chaos. If you would like to read more about my thoughts and experiences with Jordan and Addison's journey with Autism, feel free to become a follower of my blog at http://www.ripletorganizedchaos.blogspot.com/ .