actually, I'm going into MedPeds this year and want to clear up some misconceptions.
because you are an intern for 18 months instead of 12 since you are doing 2 internships
at most programs you still do internship for just 12 months. there are a few programs where internship is longer, but for the most part you become a resident at the end of one year.
less elective time, and more inpatient blocks (read: more q3 call).
true, less elective time but with the new standards for 80-hr work weeks, most call is now q4. only some places still have q3 call on the ICU months
I am unaware of any combined fellowships for both adult AND peds
A doctor at my school completed a combined fellowship in Infectious Disease and is now staff at both the adult and children's hospital. Other combined fellowships include endocrine, heme/onc, and allergy/imm. I also know a lot of people interested in cardiology and treating congenital heart disease now that patients are living longer. You can really tailor your fellowships to what interests you.
I chose MP because I'm interested in treating both adults and kids, and felt that I would be better trained to do so with a 4 year residency (as opposed to 3 yrs in FP). There's more training in Peds and you don't do OB or surgery, which I wasn't going to practice anyways. There are quite a few med-peds practices especially in the cities where there are residency programs.
It is true that the field is relatively new, so job searches may be limited by geography. Med-Peds is bigger in the Midwest and Northeast, whereas FP is bigger on the West coast. And of course, Medicine and Peds are prevalent everywhere.
If you are leaning more towards just Medicine or Peds, then I would go ahead and chose one. However, if you want the flexibility of treating both adults and kids, I would do Med-Peds