I think it really helps. My lo also had diarrhea for quite a while until we really switched her fully to soy based formula… situation improves… I’m keeping her on soy until i think she is stable enuff for me to try back cow’s milk…. The doctor once explained that when baby is hving diarrhea, lactose could aggravate the situation. So if your lo is having diarrhea for quite some time, switch!