My advice is to rank any program at which you interviewed that you consider to be acceptable (taking both the program and location into consideration). It is uncommon for a US grad to go "unmatched" in Peds, and most applicants will get one of their top choices. But if you went to the trouble to interview at a program, I would rank that program unless you feel that you would rather go unmatched than end up there. Fortunately this is usually a non-issue.Just curious how many programs people are ranking for pediatric residency? I am thinking of ranking 7 and wanted to see what the average is about.
Before you rank, ask yourself if you would be happy at that program. Most people do match at their top 3 (86% last year), but you may end up at one of the programs further down your list, so think about your ranking wisely and do not rank a program unless you are sure you want to go there.
I am ranking 6 programs. I interviewed at 12 (ended up cancelling some of my January ones towards the end). After interviewing at some of the programs, I realized they were not for me and so I am not ranking them.