advice for pediatric Med-surg interview

Hi all,
I have a pedi med-surg interview at a childrens hospital this week. I am wondering if I should prepare for them to ask me either: why pediatrics OR why med surg? or both? I applied for this job because I am very interested in obtaining a med surg position as well as a budding interest in pediatrics.
also any ideas on what interview questions I should ask? so excited