After so many problems with Dr. Casillas, I switched my son's Pediatrician. After speaking to some people, I ended up with Dr. Kahn, who is a wonderful doctor period.
He may not be the most friendly person, but he TRULY CARES about your child. He asks questions and listens which is very important when diagnosing a small child.
We moved out of the area last year so we are no longer with him but he is one of the best doctors I have seen to this day.