I am third year med student and I know of atleast 2 DO Neonatologists and 1 ped intensivist. I do not think it is that hard, you need to do a Peds residency first and then head in the fellowship direction. I think it comes down to interest and less down to competition-- if you want to do something really bad, you will work to get. With these two specialties, you should be fine-- if you can handle the 6 years or so of post graduate training. I do not know anything more about it-- I am interested in surgery and I know many DO surgeons in all fields of surgery including trauma, vascular, ortho and Neurosurgery. the bottom line is today-- the DO should not and will not stop you unless you let it. They are looking for a good candidate-- not an MD or a DO. Do well in residency and see what happens.