Pediatric Letter of Recommendation

Hey everyone, I am currently preparing my peds application for this upcoming cycle. I currently have 2 GP faculty at school who know me very well and 1 pediatric faculty who knows me very well. I was wondering for another pediatric letter of recommendation, would it be alright to have one of the residents write me one? I am with them more often than faculty and have built a good relationship with them. Would this be alright to use or would this be frowned upon?