You are probably thinking of the UNM Childrens Hospital. Right near University and Lomas. Just north of the UNM Main Campus.
My kids have been seen by Presbyterian and Presbyterian network physicians and I have nothing bad to say. If you have a child with a chronic illness, I think UNMH - Carrie Tingley is where you go though.
Go to the UNMH website for Carrie Tingley. They have lots of info. UNM Carrie Tingley Hospital Home Page (http://hospitals.unm.edu/UNMCTH/Index.shtml - broken link)