Having a "track" is less important than looking at the program's track record in placing residents into child fellowships, either internally or externally. All programs are required to offer 2 months FTE of child training, either inpatient or outpatient, which may or may not be "robust" based on the sites they have available to rotate through. It's probably best that you identify the programs where you want to train for general psych and then ask more about this topic on interviews, with senior residents, etc.
Many programs with affiliated fellowships make a point of identifying their "child-bound" G2s and starting the process of hooking them in by the beginning of PGY3 so that it can be a smooth transition--even if they don't call this a formal "track". Some programs that don't have their own fellowships are also very good about identifying and prepping residents, making sure they've completed all requirements by end of PGY3, etc. and supporting and facilitating that transfer when the time comes.