Heme/onc fellow at a large academic program checking in. I'll start by saying I think of child abuse and heme/onc fellowships as very different, both in terms of the medicine involved and the overall setting/lifestyle. PHO is one of the more busy fellowships (although it's no cardiology), in part because of the variety: inpatient service, consults, outpatient, and depending on the fellowship/job structure often 2 or 3 of those at the same time when on service. It's also intense clinically and emotionally, which I love but I know others find tiring. This can vary a lot by fellowship, but service time is typically quite front-loaded. First years are usually on call anywhere from q3-6 at most programs, whereas depending on program 2nd and 3rd year fellows may be on call 2-5 times a month, at some places even less. First year is very clinical with most places at least half-3/4 of your time on inpatient/consult service, with the rest of the time in clinic and maybe a couple electives. Years 2/3 are about 20% clinical time plus call, with the rest being research. Lifestyle as an attending can vary a ton depending on what kind of setting you're working in, but almost all PHO attendings have academic appointments (with varying levels of academic output/duties). PHO fellowship is a lot of work and commitment, but I love the medicine that I do. It is not for everyone, though; you should think hard about what you want your life in and outside of medicine to look like and chat with mentors in both fields before making a decision.