The typical advice that I have read for when babies or toddlers start biting mom while breastfeeding, is to break the babies suction by inserting your finger a little bit into his or her mouth, pulling her away and then saying "no biting." Eventually, they will get the message that if they bite during nursing, the food stops.

I learned another techinque, which is a little less disruptive and intrusive, especially if you are in a public place. This will only work if you can control the urge to jump when your child bites you (usually they don't bite very hard...).  Instead of taking them off the breast, hold them closer. Just for a few seconds, hold them closer and cover their nose with your breast. They'll get uncomforable and wiggle around  to breathe again, meanwhile relaxing their bite. You can also then tell them "no biting." Babies don't really understand the word "no" yet, so this method is  another way of showing them that when they bite, they become uncomforable. 

Well...It worked for me :)!

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