I responded to another request for pediatrician in Hinsdale area posted the same day, but somehow missed yours, so here is my experience. So far.
Du Page Pediatrics was recommended to me from my OB. They have this office for many years, great pediatricians, well respected. Check their website and read a little bit for each of the doctors.
For our 11 months old (now) son our primary doctor is Dr. Kelly - very soft spoken and nice. We’ve also seen Dr. Lynch and Dr. Davis for sick visits. Both were very good. Yes, Dr. Huang is probably not from the doctors that give prescription right away for a reason, or no reason, but some parents prefer that. We visited Dr. Hall only once – she is the youngest there, very energetic, also very nice.
We never had a problem with sick visits. They will see you the same day, in few hours, sometimes even right away. The only thing is that they want you to call them in advance, no matter what. But I guess you call them anyway, right? And they are very prompt in returning phone calls, too.
Good luck!