W.C.
I wouldn't worry too much about it. Mention it at her one year appt to the pediatrician and keep an eye out for correlations. If she's teething again that most likely is the cause. If you find a correlation with a particular food item (ours was animal crackers from 12-18 mos - processed with nuts), you may want to probe further to see if she is developing a sensitivity or allergy. Babies tend to be sensitive to juices, as I'm sure you know. Has her juice intake increased or are you cutting it with less water? More than likely it's nothing. I would just make a mental note of her diet for awhile to see if there are any correlations and mention it casually to your pediatrician at the next visit. :D