the new outfit. then has a blow out in the next one.
your baby has you saying "i don't know what's gotten into her" as much as you say "merry christmas."
ignoring that possibility sets yourself for more frustration later, and that's not fair to your baby or you.
here's the great thing, though, about the possibility of a cranky baby during the holidays. you get a pass! how your baby acts is not a reflection on your parenting skills, especially at christmas. it's a reflection on being around strange new faces in possibly strange new places, with nap time all messed up and shiny objects shoved in front of them to "open." 