Extreme PTSD can look like Autism?

I also think autism is a a fall back diagnosis when a kid is so traumatized and has no coping skills, that they introvert. We were told one of our FS was autistic or had Aspergers. No... he's MRDD and ADHD, and couldn't cope with all the chaos in his life. Not to mention the trauma and neglect he had suffered in such a short life. Stability and then a proper eval after several months to a year of stability will more likely get you the true answer to what's going on IMO. Also, there is always the adjusting when new members enter the household. I would tend to stick it out until everything settles as long as everyone's safe.. but only you know your limits.