My son started on Similac Advance with Early Shield at the hospital. He was great on it for about 3 weeks, then turned very gassy and fussy. My doctor says he was colicy and would grow out of it at 3-4 months, but it broke my heart to see him so upset and bloated from the gas so I tried all kinds of formulas to help him out: Similac organic, Similac Isolmil, Enfamil Lacto-Free, Enfamil Gentlease, Enfamil Lipil, Similac Sensitive and Sensitive RS. The only one that worked is the Similac Sensitive in the orange container. Not sure why since my pediatrician says newborns aren't lactose intolerant,...