person A: My son's pediatrician told me to call Early Intervention because he's delayed in talking.
person B: Oh no_comma_ I'm sorry to hear that. Do they have any idea what the cause may be yet?
person A: Not at all.  I'm hoping he'll catch up soon.  The appointment is set for next week and I'm pretty nervous.
person B: I hope it's nothing too serious. My younger brother had the same problem early on_comma_ but he turned out to just be a slow developer.