Our son has acid reflux and I nursed him until he was six months old.  He began showing signs of reflux at around 4 weeks.  Our pediatrician told me that if I needed to supplement Similac Sensitive would be the best formula for him.  When we started needing to supplement after I went back to work and he started daycare, we started using this formula.  I had tried the samples of the regular Similac (Blue Lid) that the hospital had given us and he spit most of it up.  When we tried sensitive, it worked much better.  By the time he was six months old he no longer wanted to nurse and only took...