I work in a medical practice and this is very common occurrence. I think in a child psychiatry program it is important to have these reminders performed and I commend the office for doing it. Think of the patient population, most of these patients cannot advocate for themselves. Sure as an adult someone has a responsibility to maintain their appointments, but when you take care of the pediatric population, they cannot neccessarily maintain their appointment indepenently unless they are a teenager. One call I think would perhaps be sufficient, but otherwise I agree with it.

My psychiatrist's (who is my therapist) office does phone call reminders. So does my primary care office, my dentist, and my kid's pediatrician. It's standard of care here so I am used to it. It's not neccessary for me but it doesn't bother me and can occasionally be helpful.