Least sad pediatric subspecialties?

So I'm thinking of what shadowing to try my M2 year and what types of electives I might want to do later. I really love the happy atmosphere of peds primary care except for the anti-vaxxers and sometimes endless ear infections/URIs. For subspecialties, I've only been exposed to areas of neuro and onc. What are some non-surgical subspecialties that are a more positive, ideally longitudinal environment where most of the kids have a good chance at living a normal life? How are Allergy/immuno or... Least sad pediatric subspecialties?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Medical Students - MD Source Type: forums