I miss:
-Having the energy and stamina to work-out hard without worrying about hydration, over-exertion etc.
-Not worrying about the food I eat. Damn you listeria and vitamin A!
-Clothes that fit (started at a size 8, not only 14/16 is comfortable and maternity wear isn't too far in my future)
-Stable weight
-Not worrying about being a good parent