I am also a nursing mother right now (8 month old son ) My IBS has gotten a lot worse since pregnancy/giving birth. I have been drinking Heather's Tummy Teas and taking the Acacia fiber supplement and following the IBS Diet and am still making as much milk as ever. Of course I checked with two lactation consultants first to see if peppermint and fennel tea were safe while breastfeeding and was told by both that they are fine. In fact, they think fennel may increase milk supply and is safe for both mother and child. It of course could not hurt to call a lactation consultant/doctor of your own, but I was told that it is most definitely fine to drink both fennel and peppermint tea. And I must say, Heather's Tummy Teas, Tummy Fiber, and Eating for IBS book have helped me SO much. I have felt great for weeks now. Not getting much sleep because of our children makes IBS symptoms worse because of the stress, but I have found the above stated supplements to be so helpful!
Hope I helped, but feel free to talk to your own doctor if it will help ease your worries.
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Re: ??Safe Herbs..for lactating (nursing) mom
) My IBS has gotten a lot worse since pregnancy/giving birth. I have been drinking Heather's Tummy Teas and taking the Acacia fiber supplement and following the IBS Diet and am still making as much milk as ever. Of course I checked with two lactation consultants first to see if peppermint and fennel tea were safe while breastfeeding and was told by both that they are fine. In fact, they think fennel may increase milk supply and is safe for both mother and child. It of course could not hurt to call a lactation consultant/doctor of your own, but I was told that it is most definitely fine to drink both fennel and peppermint tea. And I must say, Heather's Tummy Teas, Tummy Fiber, and Eating for IBS book have helped me SO much. I have felt great for weeks now. Not getting much sleep because of our children makes IBS symptoms worse because of the stress, but I have found the above stated supplements to be so helpful! 
