After trying both Similac Advance w/Iron and Isomil Advance w/iron (both of which left my newborn son gassy and uncomfortable, my pediatrician recommended trying Nestle Good Start Supreme DHA&ARA. This formula is made from whey protein and Nestle refers to it as comfort proteins which are easier to digest. The comfort proteins have certainly made a difference for my son. He took to the Good Start immediately and no longer suffers from constant gas pains. I highly recommend Nestle Good Start Supreme DHA&ARA.