Hoo boy (to your doctor
). Here's the real skinny on yeast in the gut:
Yeast lives in most people's gut. When we consume sweets, including dairy (lactose) and carbohydrates that break down into sugars during digestion, THAT is what ferments in the gut with the help of the yeast.
It is possible that there is an imbalance of gut flora behind the wind. In my DD#1's case, I received an A/B IV during labor as I was GB Strep+, and for the first few days Natalie had so much nasty wind; she could clear a room with those newborn baby farts even before my milk had fully come in. One day while I nursed her, I put some probiotics on my nipple before I put her to the breast and it cleared right up.
On the other hand, if your LO isn't able to digest the proteins in dairy or soy or other foods, her gut will be irritated and she will exhibit similar symptoms. Here's a link to post on food intolerances:
http://babywhispererforums.com/index.php?topic=189899.0