I agree with much of the advice you've gotten - a new baby can manifest itself as stress in a variety of ways - not to mention all the ways 4-year-olds are "so big" but yet, still so small. It's a big emotional time for them even without a baby. Watching fluid intake can be a good idea - it works with my 4-year-old, especially since we recently had a physical reason for bedwetting and are working ourselves back. I thought we were there (physically alright) but had to give some more time for the emotional getting on track. It sounds like this has gone on for a while, and so this next idea is unlikely, but have you had your daughter checked for pinworms. They are small and basically harmless, but, especially in girls, can cause urinary problems, especially at night. Plus, preschool is the age when they usually get them because of the way they play. It's about the easiest test ever (scotch tape on the bottom - no joke!) and was the recent cause of many massive loads of laundry at our house - but now I know the physical has ended and am journeying through the emotional. We have a 17-month-old also, so it's no "new baby" stress, but my daughter's just going through that emotional time of being 4 (ah, the age of, "you're not my friend anymore..." isn't it fun?) so we're working on that. After a few weeks of the pill treatment for the pinworms and some back and forth with underwear or goodnights) she has been dry enough that I'm going to let her wear underwear (as long as she goes potty just before bed). Wow, that was much longer than I meant it to be, but pinworms may be something to check if you haven't already. If it's not that or a UTI, then just gently caring for her as you have been is probably best. Having just gone through it (and still a bit in it) I know the sleep depravation (plus my little one has had some really tough ear infections, so I've been getting up at night as though she were a newborn). If you want to talk more or just vent, let me know! I'll be praying for you all!