Hmm..well I don't know about bubble baths specifically but baths in general are more likely to cause a UTI, especially if you get them easily.
http://healthcenter.ucdavis.edu/selfcare/vaginal.htm <---I googled some key words from your question and this site says that if you want to avoid yeast infections it's best to avoid bubble baths. Scroll to the bottom of the page under self care/prevention to see other tips.
In general though, I don't think an occasional bubble bath will cause you too many problems. I wouldn't worry too much :D
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Date: 2005-06-25 12:44 pm (UTC)http://healthcenter.ucdavis.edu/selfcare/vaginal.htm <---I googled some key words from your question and this site says that if you want to avoid yeast infections it's best to avoid bubble baths. Scroll to the bottom of the page under self care/prevention to see other tips.
In general though, I don't think an occasional bubble bath will cause you too many problems. I wouldn't worry too much :D