I bought probiotic drops, which contain Lactobacillus reuteri, and it was the only thing I found to work for my colicy, preterm daughter. It helped within a few days to alleviate her gas. While it didn't eradicate the colic completely, it did help profoundly. It also helped clear up diarrhea from a milk allergy. I am now using it again on my new preemie baby to help with her gas. I HIGHLY recommend despite the high price tag. It's worth it!