Glad to hear from you!
Don't jump to worrisome conclusions about Liam. It could very well be a language delay and nothing more. Not that a language delay is trivial, but I think that requires fewer interventions than autism. Autism is characterized by (a) impairments in social interaction, (b) impairments in language, and (c) repetitive and stereotypical behavior. All three areas have to be there. Although my husband and I have never truly been worried that Connor has autism, we've had a "concerned" comment or two from relatives and I've read extensively about it.
Connor turned 4 in December, and we have suspected that he has a language delay since he was about 2. I have had him evaluated by the state EI program and our school district, but for various reasons, I don't have the highest confidence in the free public programs. We just had him evaluated by this
organization, and my husband and I were very happy with our experience there. They are located in Nashville, and there is a fee, but I was able to pay for it from our health savings account (HSA). PM me if you want any more info, phone numbers, etc. and I'd be happy to help you.
BTW, Connor has (as we've thought all along) a receptive and expressive language delay. He definitely does not have apraxia, ADHD, or autism.
Best wishes for job hunting and congratulations to your husband on completing the Ph.D.