Hi, My 7 year old has been experiencing stomach pain leading to diarrhea and a lot of belly discomfort. The attacks come on suddenly after dairy but not always. He takes a probiotic for kids and today our doctor told us that the probiotic may be destroying his good bacteria. Yet our other son 9 who also had these problems is doing great with a probiotic. Can it be true a probiotic can kill good bacteria? This goes against everything I have read. Thanks