NU girl,
Unfortunately, I think you got some very bad advice from your med school. If I remember correctly, you had a baby early 4th year and will graduate in August. Thus, you are looking to start your prelim year in mid August? Most places have two weeks of orientation, so you would have to start in September. I know some people who had late starts, but it seems like programs like to have people start either in June/July or December/January. If I were you, I think you should have considered taking a year off. I know this does not help you now. You are going to be fighting a hard battle getting everything to line up. Your prelim program has to agree and advanced year to agree to a late start. You cannot do an advanced year without doing a prelim year. I think your best bet is to get your advanced position PD involved. He has the most to gain by helping you and is likely to at least try. I wish you the best. I do think you have to make a choice. Either leave your husband for a year (you can take the baby and get a nanny or a family relative to live with you) or risk having to go through the match again. Then, you will have the problem of finding another residency taking you after you refused matriculation. This will be compounded by your inflexibility because your husband may be limited in areas wanting to hire him. I know none of these are great options, but I think you will have to make a sacrifice.