G.B.
Hi Holly,
I am a speech-language pathologist working in the early intervention system in Chicago (I'm at UIC). If you are concerned, you can contact directly your local Child and Family Connections (CFC) and obtain a referral for a free home-based evaluation. You don't need a physician's prescription for the eval (only if the eval team finds that your child needs services you will need one; but don't worry about this right now).
The CFCs, depending on their geographical location, work with many providers: non-for-profit agencies (e.g., UIC, Easter Seals, El Valor, etc.), private agencies, and independent providers. You have the right to choose the provider for the evaluation. The composition of the evaluation team varies according to your concerns. For example, if your only concern is speech/language, then you will get a speech-language pathologist (SLP) (who addresses your specific concerns) and a developmental therapist (DT) (who takes a global look at your child and makes sure there are no other red flags in other areas of development).
Here is the link to a listing of CFCs. CFCs go by numbers; the numbers serving Chicago are 8, 9, 10, & 11 (check out your zip code):
http://www.wiu.edu/ProviderConnections/links/CFCList.html
When you call, ask to speak to a service coordinator (SC), who will be your personal link/resource to EI services. CFCs also count with parent liaisons, which are parents who had kids receiving EI services and know the "ins" and "outs" of the system; they are an additional resource for you if you have any questions or need advice.
I would not suggest contacting your local public school system, as your son is under 3 and, therefore, eligible for early intervention services should they be recommended.
If after the evaluation it is determined that your child needs services, then you, your SC (also present in the eval), and the evaluation team will write a document called the Individualized Family Service Plan (IFSP). This document specifies the services recommended/frequency/strategies, etc. and all the information needed to understand the "plan" for helping your child accomplish the goals that you and your family set for him. Once again, you have the right to choose a provider (once again, one of the many agencies/providers working with the CFCs--it does not need to be the same provider that evaluated your child).
Once your child turns 3, his home-based (or center-based, whatever you choose) services will be discontinued. If he continues to need services, he will be transitioned to the public school system, where he will get center-based services as indicated in his Individualized Education Plan (IEP).
I hope this was helpful. Navigating the EI system can be cumbersome some times, but if your child needs that extra push to help him catch up, it is totally worth it! Feel free to email me with any questions.
G.