Which yogurt helps with possible yeast ?

Yogurt does not have enough probiotic to help with yeast. You need to use an anti-fungal to treat the yeast and you should give your son an oral probiotic supplement. My son has a very stubborn case of internal yeast and we have used oral nystatin in the past but now I am using oral diflucan suspension. I am also giving my son intestinex (probiotic supplement) I dissolve the probiotic in a little water and have him drink it. For my son's anus I dilute 5 drops of Citricidal Grapfruit Seed Extract in about 5 oz of water. I squeeze a cottonball-full of the solution on his butt-hole ever time it potty him (every diaper change). This solution has been the ONLY thing that has worked for his butt yeast, after about 2-3 days the rash started to disappear. The doctor says to keep using this solution until there is absolutely no rash.

Breast milk will make yeast worse b/c yeast lives on sugars.

Our very holistic MD (pedi) told me that yogurt is not nearly enough. A child with NO yeast (so I'd assume a child with yeast problems would need more) needs to have a probiotic around 10 billion a day (while yogurt only has around 1 million).