I've met a handful of people completing psych as a second residency, or after completing an intern year elsewhere, and all starting as PGY2's. One guy finished family med and immediately went into psych. Also know younger people have transferred after 1 year of surgery, IM, rads, recognizing psych was what they really wanted. Older folks I've seen from anesthesiology, family med, and ophthalmology, combination of interest in the specialty plus other pragmatic issues (aging ophthalmologist with mild tremor affecting surgery, anesthesiologist with history of substance use in remission making primary specialty a bit risky with access to controlled meds). I know a small number of residencies seem to specifically hold a spot to recruit a PGY2 transfer as a way to diversify the resident mix and have found good benefit for the group dynamics bringing in people with different backgrounds. I'm not privy to the details of how prior training was credited, but it seemed like they all started as PGY2s and on track to complete general psych residency in 3 years. I'm unsure how this would work if you wanted to fast track into child, if that's even possible.