I started out breastfeeding my kids but after a bit I decided to supplement with formula because it seemed like they just were not getting enough from me. We tried the similac as those were the samples that our hospital had when i was trying to learn the best technique with my first. We tried the enfamil as well but they were just too hard on their tummies. One of my husband's co workers suggested we try the protect plus formula. So we did. It make a difference. They didn't scream and cry after eating from tummy aches. They didn't have nearly as much gas. And my daughter stopped spitting up so much. I do wish that I could have just breastfed exclusively but I am glad that I found this formula. It is in my opinion a bit on the expensive side but if you sign up for their rewards program you can usually get coupon checks which do help defray the cost for the first few months.