E.M.
you will be amazed at the ammounts of love that you will have!! I thought the same thing, worried that I would have a "favorite". But now, I have a 2 1/2 year old and twins that will be 1 year old on Thanksgiving day. I couldnt love them more, and I love them all the same. They are ALL my favorites!
and that is not an "irrational" fear. it is one that many many of us have had. it just shows how much love you really have!