My son was born a month early, and for many reasons, including lack of knowledge, breastfeeding didn't work out. We started him on Enfamil Lipil. We eventually switched him to Similac Advance due to the doctor's reccomendation. He continued on Similac for about three months, and while he finally began gaining weight well, he was having a lot of problems with gassiness and constipation. His doctor thought it would pass within a few weeks, and when it didn't, he told me to try Nestle Good Start. Within two days of starting the Good Start, it was like having a different child! We no longer had to...