For gen peds, people have lots of interests. ADHD is a common one. Obesity is becoming more prevalent and having general pediatricians that can manage that would be a lifesaver for my practice. We also need pediatricians who can easily navigate the complexities of LGBT teens, so that's certainly another niche. A lot of peds like the school aged kids and dislike teens, so I'm sure you can also develop a niche there (though referrals would be less since most of them don't need to be seen as frequently as babies do). Psychopharm is a desperately needed area in peds in general and a lot of pediatricians are getting certifications to do initial psych med management to free up some of the referrals to psychiatry for the complex patients.