Many infant formulas tend to cause excessive gas because bubbles form in the mixing process. When your baby swallows this air, it can get trapped in their stomach. While Enfamil AR is designed to be thicker and alleviate reflux, it does create more bubbles than most other formulas. These bubbles can lead to gas, which can lead to another set of issues you may not be willing to trade for excessive spit-up. However, every baby is different, and Enfamil AR does work for some babies. Enfamil Gentlease, on the other hand, is specifically designed to help reduce gas, which means the bubbles it creates when mixing is minimal, but they are still there. In some cases, Gentlease doesn’t work as well as you might hope, which means it’s on to another solution.