I mean, if you stay out of PICU and ED, in general, you're not going to see that many children who are abused. You'll see some neglect, certainly, but not many abused. And stay away from Heme/Onc and NICU if you can't handle patients dying (though NICU tends to be a bit easier to rationalize death, since most of the time, the babies shouldn't have been born yet).
Pulm you'll see patients die occasionally of really bad asthma or CF; Cards you'll see a number of congenital heart patients die. Genetics, they tend to have life limiting illnesses at baseline, so also not great. ID you don't see too many deaths except for severe infections--which you see briefly as a consultant. Not too many outpatient ID patients die. But you'll also have to deal with neglect a fair amount, and crazy, crazy parents. Endo, you may see some deaths, and may see some neglect and abuse, but it's not terribly frequent. Allergy, you'll occasionally have a patient with anaphylaxis that may die, but again, not terribly common. GI has its own issues with psych patients, but not too many deaths. Some abuse, though, and certainly neglect. Neuro is largely seizures, headaches, and sleep issues, but you may take care of patients with muscular dystrophies that die young, or neuroimmunological disease (like MS) that have chronic disabilities. Rheum you probably don't see too many deaths.
Bottom line, you'll see it in every field, but it'll be least concentrated in the outpatient heavy specialties. But if you can't handle sick kids, you probably shouldn't go into pediatrics. We tease that we became pediatricians to work with kids and to be a forever kid, but really, we enjoy the medicine more than adult medicine (because it is a totally different beast). If we couldn't deal with sick kids (or their parents), we wouldn't go into peds in the first place.
