great, thanks for that!the nuby one that i had initially def let some water out if she bit on it, but worked better with a suck. the new nuby one i got today seems to work less with a bite, so she is sucking it more than she was the other one..hoping this wil work.was in agony yesterday when she bit me during a feed....not good!!thanks so much for the probiotic tip....would never have thought of that!